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is_canonical
bool
2 classes
a
a
tier4
function_word
neutral
plain
The word a functions primarily as an indefinite article in English, signaling non-specific reference. It is also the name of the first letter of the alphabet, written as both A (uppercase) and a (lowercase). The indefinite article helps learners mark a noun as one member of a class rather than a particular instance, en...
null
480
true
a
a
tier4
function_word
grade_5
plain
The word a usually works as an indefinite article, a grammar word for one non-special thing. It can introduce one thing from a group. For example, a cat means any one cat, not one special cat. The word a also names the alphabet’s first letter. We write it as A or a. Writers use a to make sentences and stories flow. Use...
5.13
415
false
a
a
tier4
function_word
college
plain
In English, a primarily functions as an indefinite article, marking a singular noun as an unspecified member of a class rather than a particular individual. The same form names the alphabet’s first letter, which appears as uppercase A and lowercase a. As an article, it introduces new or non-specific referents, supporti...
13.5
443
false
a_couple_of
a couple of
tier4
function_word
neutral
plain
a couple of “A couple of” is an English quantificational phrase derived from the noun couple, historically meaning an exact pair. In contemporary usage it functions as a determiner-like expression preceding count nouns (e.g., a couple of days, a couple of students). In its most literal and historically prior sense, it...
null
219
true
a_couple_of
a couple of
tier4
function_word
grade_5
plain
The phrase “a couple of” comes from couple, which once meant exactly two. Today, it comes before plural things we can count, such as days or students. It usually means two. In casual speech, it can also mean a small number, such as two or three or a few. This makes the number less exact. In grammar, “a couple of” work...
6.1
140
false
a_couple_of
a couple of
tier4
function_word
college
plain
“A couple of” is an English quantificational phrase originating in the noun couple, which historically referred to an exact pair. In present-day usage, it precedes plural count nouns, as in “a couple of days” and “a couple of students.” Its literal sense denotes two items, but many speakers, particularly in informal co...
14.59
195
false
a_few
a few
tier4
function_word
neutral
plain
a few is an English indefinite quantifier phrase denoting a small, imprecise number of countable entities, greater than one but contextually restricted and vague. Syntactically, it functions as a determiner within noun phrases (e.g., a few students, a few questions) and can also appear in partitive constructions (a few...
null
196
true
a_few
a few
tier4
function_word
grade_5
plain
A few means a small number of things you can count. The number is more than one, but it is not exact. You can say “a few students” or “a few of the samples.” A few usually means that some people or things are there. Bare few often suggests that almost none are there. Both phrases describe a small group. The exact numbe...
5.31
112
false
a_few
a few
tier4
function_word
college
plain
A few is an English indefinite quantifier phrase for a small, imprecise number of countable entities, normally more than one but bounded by context. It functions as a determiner in noun phrases such as a few students and a few questions, and it also occurs in partitive phrases such as a few of the samples. Unlike bare ...
13.65
180
false
a_great_deal_of
a great deal of
tier4
function_word
neutral
plain
a great deal of is an English multi-word quantifier phrase used to denote a large but indefinite quantity or degree, typically with uncountable nouns (e.g., a great deal of information, a great deal of effort). Semantically, it is broadly equivalent to much or a lot of, but it tends to occur in more formal or academic ...
null
207
true
a_great_deal_of
a great deal of
tier4
function_word
grade_5
plain
A great deal of means a large, unknown amount or degree. It usually comes before things that cannot be counted, such as information or effort. It means much or a lot of, but sounds more formal, especially in writing. The phrase combines a, great, deal, meaning an amount, and of before the noun. In grammar, a great dea...
4.8
149
false
a_great_deal_of
a great deal of
tier4
function_word
college
plain
A great deal of is an English multiword quantifier that indicates a large but indefinite quantity or degree, normally with uncountable nouns such as information and effort. It is broadly synonymous with much and a lot of, but it has a more formal or academic profile, particularly in writing. The phrase comprises the in...
12.94
196
false
a_level
a-level
tier4
proper_noun
neutral
plain
A-level (short for Advanced Level) denotes a set of subject-based qualifications constituting the principal school-leaving and university entrance standard in England, Wales, and Northern Ireland. Introduced in 1951 as part of the General Certificate of Education (GCE) reforms, A-levels were designed to provide advance...
null
217
true
a_level
a-level
tier4
proper_noun
grade_5
plain
A-level means Advanced Level. It is a group of school subjects and exams. A-levels are the main school-leaving and university entrance qualification in England, Wales, and Northern Ireland. They began in 1951 during changes to the General Certificate of Education, or GCE. A-levels gave students deeper study than the wi...
8.31
214
false
a_level
a-level
tier4
proper_noun
college
plain
A-level, abbreviated from Advanced Level, is a subject-specific qualification that serves as the main school-leaving and university-entry credential in England, Wales, and Northern Ireland. Established in 1951 through reforms to the General Certificate of Education, it was intended to offer advanced, specialized study ...
18.22
194
false
a_little
a little
tier4
function_word
neutral
plain
A little is an English quantificational phrase used primarily to denote a small amount of an uncountable noun or a limited degree of some quality, state, or process. In standard usage, it functions as a degree modifier (e.g., “a little tired”), a quantifier of mass nouns (e.g., “a little water”), and, in some contexts,...
null
203
true
a_little
a little
tier4
function_word
grade_5
plain
A little means a small amount of something that cannot be counted separately. It can also show a small amount of a feeling or action. We say “a little tired” or “a little water.” It can make a statement sound less strong, as in “I am a little worried.” It usually comes before describing words, action words, or things l...
5.34
147
false
a_little
a little
tier4
function_word
college
plain
A little is an English quantificational phrase that indicates a small amount of a mass noun or a limited degree of a quality, state, or process. It can modify adjectives and adverbs, as in “a little tired,” quantify mass nouns, as in “a little water,” and soften an assertion, as in “I am a little concerned.” It general...
12.41
200
false
a_lot_of
a lot of
tier4
function_word
neutral
plain
a lot of is a highly frequent English quantifier used with both countable and uncountable nouns to indicate a large number or amount, as in a lot of students or a lot of information. Syntactically, it functions similarly to many and much, but unlike those forms it is largely register-neutral in contemporary spoken and ...
null
237
true
a_lot_of
a lot of
tier4
function_word
grade_5
plain
A lot of is a common phrase for many things or much stuff. It works with things you can count, like students, and things you cannot, like information. It works much like many and much. In speaking and casual writing, it sounds normal. Lots of usually means the same thing, but sounds more casual. In school writing, peo...
4.92
204
false
a_lot_of
a lot of
tier4
function_word
college
plain
A lot of is a highly frequent English quantifier, used with both count and mass nouns to denote a large number or amount, as in a lot of students and a lot of information. It patterns syntactically with many and much, but in contemporary speech and informal writing it is comparatively neutral in register. In most conte...
13.66
240
false
a_pair_of
a pair of
tier4
function_word
neutral
plain
a pair of is an English quantificational expression used to designate two items that are conceived as a single unit. Syntactically, it consists of the indefinite article a, the collective noun pair, and the preposition of, followed by a noun phrase. Semantically, it profiles a cardinality of two while foregrounding uni...
null
243
true
a_pair_of
a pair of
tier4
function_word
grade_5
plain
A pair of means two things treated as one group. It has a, pair, and of before a noun. It shows two things that belong together, not just the number two. People use it in school, work, and daily speech. It can name scissors, trousers, gloves, shoes, variables, or hypotheses. With these nouns, speakers may use is or are...
3.89
102
false
a_pair_of
a pair of
tier4
function_word
college
plain
A pair of is an English quantificational expression for two items understood as a single unit. Its form combines the indefinite article a, the collective noun pair, and the preposition of, followed by a noun phrase. It presents two as a unified or functionally complementary grouping rather than as a bare count. The con...
13.41
236
false
a_project
a project
tier4
function_word
neutral
plain
A project is a temporally bounded, goal-oriented undertaking composed of coordinated activities designed to produce a specific outcome, product, or change. In general academic discourse, the term typically denotes a structured endeavor such as a research project, design project, or development project, distinguished fr...
null
214
true
a_project
a project
tier4
function_word
grade_5
plain
A project is a planned task with a clear goal and an end date. It uses several related activities to create a result, product, or change. Unlike regular work, a project is new, has stated goals, and ends after a set time. One person or a team can do it. A plan usually lists the work, methods, schedule, and resources ne...
7.33
165
false
a_project
a project
tier4
function_word
college
plain
A project is a time-limited undertaking organized around an explicit objective and carried out through coordinated activities. Its intended result may be a change, a product, or another defined outcome. In academic usage, the term commonly refers to structured work such as research, design, and development. A project d...
13.8
220
false
a_school
a school
tier4
function_word
neutral
plain
A school is a formal institution or organized setting dedicated to systematic instruction, typically within a structured curriculum and under the guidance of trained educators. In its most common contemporary sense, a school denotes an establishment providing primary and secondary education, often within a regulated na...
null
193
true
a_school
a school
tier4
function_word
grade_5
plain
A school is a place where teachers help students learn many subjects. Most schools teach children from their first years through their teenage years. Schools follow a planned course of lessons, which sets what students should learn. They often have grades, daily schedules, tests, and school leaders. A school can also m...
5.93
105
false
a_school
a school
tier4
function_word
college
plain
A school is a formal institution or organized setting devoted to systematic instruction, usually following a defined curriculum and led by trained educators. In its most common contemporary use, the term refers to an establishment offering primary and secondary education within a national or regional regulatory system....
16.49
178
false
a_single
a single
tier4
function_word
neutral
plain
A single is a common English noun phrase formed by the indefinite article "a" and the adjective-noun "single," denoting one item, unit, or instance as distinct from a larger set, aggregate, or potential plurality. While "single" primarily functions as an adjective meaning one in number or unmarried, the phrase "a singl...
null
234
true
a_single
a single
tier4
function_word
grade_5
plain
A single means one thing, person, unit, or event among many possible choices. It combines the article “a” with “single,” which means one. “Single” usually describes a noun, but it can stand alone when that noun is understood. For example, “a single” might mean one room or one ticket. People use “a single” in everyday s...
6.56
151
false
a_single
a single
tier4
function_word
college
plain
A single is a noun phrase built from the indefinite article “a” and the adjective “single,” used to identify one item, unit, or occurrence rather than an aggregate or possible plurality. Although “single” ordinarily modifies a noun to indicate numerical oneness or unmarried status, “a single” is substantivized in many ...
14.62
206
false
aaa
aaa
core
proper_noun
neutral
plain
The string AAA operates as a cross-domain acronym and symbol in contemporary discourse, illustrating how a simple three-letter sequence can encode multiple high-salience concepts. While the all-lowercase form aaa often appears as a neutral placeholder or in instructional examples, the capitalized variant AAA signals do...
null
343
true
aaa
aaa
core
proper_noun
grade_1
plain
AAA is a short name with many uses. The small form, aaa, can fill a blank spot. It can also appear in school work. The big form, AAA, has special uses in money, computers, shows, power cells, and sports. In money, AAA means a very safe pay score. It means a group can likely pay its bills. It does not mean no trouble wi...
3.24
281
false
aaa
aaa
core
proper_noun
grade_5
plain
AAA is a short name with many uses. The small form, aaa, can fill a blank or help in a lesson. The big form, AAA, has special uses in money, computer safety, shows, tools, and sports. In money, AAA means the best credit rank. It shows that a person or group can likely pay back what it owes. It cannot stop all money ris...
4.59
247
false
aaa
aaa
core
proper_noun
grade_10
plain
AAA is a three-letter acronym with several prominent meanings across modern public life. The lowercase form, aaa, often serves as a neutral placeholder in instructions or examples. The capitalized form points to specialized uses in finance, security, entertainment, hardware, and sport. Its range of meanings shows why c...
13.28
296
false
aaa
aaa
core
proper_noun
college
plain
AAA is a cross-domain acronym and symbol whose meanings vary substantially by context. In lowercase, aaa commonly functions as a neutral placeholder in instructional material and examples; in capitals, AAA carries established meanings in finance, information security, entertainment, hardware, and sport. Its polysemy de...
16.89
320
false
aac
aac
tier4
proper_noun
neutral
plain
AAC is a three-letter abbreviation that most prominently denotes Advanced Audio Coding, a lossy digital audio compression standard defined in the MPEG-2 and MPEG-4 specifications. In this technical sense, AAC is designed to achieve higher sound quality than earlier formats such as MP3 at comparable or lower bit rates. ...
null
214
true
aac
aac
tier4
proper_noun
grade_5
plain
AAC usually means Advanced Audio Coding, a lossy audio format used to shrink digital sound files. Lossy means some sound information is removed to make files smaller. AAC is part of the MPEG-2 and MPEG-4 specifications, which are sets of rules for digital media. It can sound better than MP3 while using the same or less...
8.13
201
false
aac
aac
tier4
proper_noun
college
plain
AAC most commonly denotes Advanced Audio Coding, a lossy digital audio compression standard specified in MPEG-2 and MPEG-4. The standard is intended to provide higher perceived sound quality than earlier formats such as MP3 at comparable or lower bit rates. It combines psychoacoustic modeling, transform coding, and adv...
15.89
193
false
aachen
aachen
tier2
proper_noun
neutral
plain
Aachen is a city in western Germany, situated in Nordrhein-Westfalen near the tri-border region with Belgium and the Netherlands. Its approximate coordinates are 50.7753° N, 6.0839° E. The city fuses a long-standing spa heritage with a contemporary emphasis on science and engineering. Historically, Aachen served as the...
null
401
true
aachen
aachen
tier2
proper_noun
grade_5
plain
Aachen is a city in western Germany. It is in North Rhine-Westphalia, near Belgium and the Netherlands. The city has old spa traditions and a strong focus on science and engineering. Charlemagne lived in Aachen and made it his capital. Aachen Cathedral shows the city's religious and royal history. Today, Aachen is an ...
8.29
339
false
aachen
aachen
tier2
proper_noun
college
plain
Aachen is a city in western Germany, in North Rhine-Westphalia near the borders of Belgium and the Netherlands. Located at approximately 50.7753° N, 6.0839° E, it combines a long spa tradition with a modern concentration on science and engineering. Historically, it was Charlemagne’s residence and capital, and it became...
15.16
375
false
aalborg
aalborg
tier4
proper_noun
neutral
plain
Aalborg (Danish: Aalborg or Ålborg) is a major industrial, commercial, and cultural city in northern Jutland, Denmark, situated along the narrow strait of the Limfjord. With a municipal population exceeding 200,000, it constitutes one of Denmark’s largest urban areas and functions as the principal center of the North J...
null
224
true
aalborg
aalborg
tier4
proper_noun
grade_5
plain
Aalborg is a large city in northern Jutland, Denmark. It lies beside the narrow Limfjord and has more than 200,000 people. It is an important center for North Jutland. Its crossing over the water helped trade, travel, and defense grow there. People lived near Aalborg during the Viking Age. In the Middle Ages, the town...
7.24
138
false
aalborg
aalborg
tier4
proper_noun
college
plain
Aalborg, also written Ålborg in Danish, is a major city in northern Jutland, Denmark, on the narrow Limfjord. Its municipality has more than 200,000 residents, making it one of the country’s largest urban areas and the main center of the North Jutland Region. Because the city occupies a natural crossing of the fjord, i...
14.31
195
false
aalii
aalii
tier4
simplex
neutral
plain
Aalii is the Hawaiian common name for the evergreen shrub or small tree Dodonaea viscosa (family Sapindaceae). Native to Pacific littoral zones, it is valued for drought tolerance, wind resistance, and resilience in saline environments. In Hawaiian culture, aalii operates as more than a plant: it embodies ecological ut...
null
329
true
aalii
aalii
tier4
simplex
grade_5
plain
Aalii is a Hawaiian name for an evergreen shrub or small tree. Its scientific name is Dodonaea viscosa. It belongs to the soapberry family. It grows near the Pacific Ocean. It can live through dry weather, strong winds, and salty water. Hawaiian people value it as more than a plant. It shows how plants can help people ...
5.44
291
false
aalii
aalii
tier4
simplex
college
plain
Aalii is the Hawaiian vernacular name for Dodonaea viscosa, an evergreen shrub or small tree in the family Sapindaceae. Native to Pacific coastal environments, it is notable for tolerating drought, strong winds, and saline conditions. Within Hawaiian culture, the plant signifies more than practical botanical value: it ...
15.01
363
false
aaliyah
aaliyah
tier3
proper_noun
neutral
plain
Aaliyah is a feminine given name of cross-cultural resonance, most commonly encountered in English-language contexts. Its etymology is typically traced to the Arabic root associated with “exalted” or “noble” and, through cross-cultural contact, to the Hebrew aliyah meaning “ascension” or “immigration to Israel.” The re...
null
348
true
aaliyah
aaliyah
tier3
proper_noun
grade_5
plain
Aaliyah is a girl’s name used in many cultures, especially by English speakers. Its roots may come from Arabic words meaning “high” or “noble.” It may also connect with the Hebrew word aliyah, meaning “rising” or moving to Israel. The name can suggest honor, goodness, and success. Onomastics, the study of names, shows ...
7.93
247
false
aaliyah
aaliyah
tier3
proper_noun
college
plain
Aaliyah is a feminine given name with cross-cultural resonance, most frequently encountered in English-speaking settings. Its origin is commonly associated with an Arabic root conveying “exalted” or “noble,” while contact with Hebrew has linked it to aliyah, meaning “ascension” or “immigration to Israel.” The name cons...
16.16
355
false
aalst
aalst
tier4
proper_noun
neutral
plain
Aalst Aalst is a historic city in the province of East Flanders, Belgium, perched along the river Dender. As a long-standing market town, it played a central role in regional trade and urban culture dating back to the High Middle Ages. The city’s physical fabric embodies Flemish urbanism: a compact historic core organ...
null
294
true
aalst
aalst
tier4
proper_noun
grade_5
plain
Aalst is an old city in East Flanders, Belgium. It stands beside the Dender River. For many years, people came there to buy and sell goods. Trade helped Aalst grow during the Middle Ages. The old center has a main square, grand buildings, churches, streets, and waterways. Roads and trains connect the city with nearby p...
7.34
215
false
aalst
aalst
tier4
proper_noun
college
plain
Aalst is a historic city in East Flanders, Belgium, situated on the Dender River. As an established market town, it became important to regional commerce and urban culture during the High Middle Ages. Its built environment reflects Flemish urbanism: a compact historic center arranged around a central square, with civic...
14.5
279
false
aalto
aalto
tier4
proper_noun
neutral
plain
The Finnish noun aalto denotes a wave—a propagating disturbance that transfers energy through a medium or field without a net transport of matter. In everyday Finnish, aalto covers ocean swells, ripples, and the broader idea of undulatory propagation. In science, the term points to the universal concept of a wave acros...
null
350
true
aalto
aalto
tier4
proper_noun
grade_5
plain
In Finnish, aalto means wave. A wave carries energy through water, air, or empty space. It does not carry matter along with it. Finnish speakers use aalto for ocean waves, small ripples, and wave-like movement. Scientists use it for waves in sound, light, and electricity. With a capital letter, Aalto becomes a family n...
7.65
296
false
aalto
aalto
tier4
proper_noun
college
plain
The Finnish noun aalto means “wave”: a propagating disturbance that conveys energy through a medium or field without producing a net movement of matter. In ordinary Finnish, it may refer to ocean swells, surface ripples, or undulatory motion more generally. In scientific contexts, it denotes the cross-disciplinary conc...
15.95
328
false
aar
aar
tier4
proper_noun
neutral
plain
aar is not a canonical English lexical item; in general academic usage its significance rests primarily in the acronymic form AAR and, less commonly, as a string encountered in multilingual vocabulary. The sequence also appears at the outset of Afrikaans/Dutch-origin terms such as aard- (earth), which helps illustrate ...
null
362
true
aar
aar
tier4
proper_noun
grade_5
plain
Aar is not usually an English word. AAR is mostly used as an abbreviation. The letters can also appear in words from Afrikaans or Dutch. For example, aard means earth in those languages. This shows that short letter groups can have different jobs. They can begin words in one language. They can also shorten names in spe...
6.75
303
false
aar
aar
tier4
proper_noun
college
plain
Aar is not generally recognized as a canonical English lexical item. In academic usage, its main relevance lies in the acronym AAR and, less often, in multilingual vocabulary. The sequence also begins Afrikaans- and Dutch-derived forms such as aard-, meaning “earth.” It therefore illustrates how a short letter sequence...
15.17
346
false
aardvark
aardvark
tier2
simplex
neutral
plain
The aardvark is a nocturnal, insectivorous mammal native to sub-Saharan Africa. It is the sole living representative of the order Tubulidentata and the genus Orycteropus, with the species Orycteropus afer. The etymology traces to Afrikaans for “earth pig,” reflecting its fossorial habits. Its ecological significance li...
null
319
true
aardvark
aardvark
tier2
simplex
grade_5
plain
The aardvark is a night mammal from Africa south of the Sahara. It eats ants and termites. It is the only living kind in its group, Tubulidentata, and its species is Orycteropus afer. Its name comes from Afrikaans and means “earth pig.” The name fits because aardvarks dig homes underground. Aardvarks control insect num...
6.05
291
false
aardvark
aardvark
tier2
simplex
college
plain
The aardvark is a nocturnal, insectivorous mammal native to sub-Saharan Africa. It is the sole living representative of the order Tubulidentata and the genus Orycteropus; its species is Orycteropus afer. The name derives from Afrikaans for “earth pig,” an allusion to its burrowing habits. Ecologically, the aardvark sup...
15.18
288
false
aardwolf
aardwolf
tier4
simplex
neutral
plain
Overview The aardwolf (Proteles cristatus) is a small- to medium-sized African carnivore that occupies a distinctive niche within the family Hyaenidae. Unlike its larger, bone-crushing hyena relatives, the aardwolf is almost exclusively an insectivore, feeding primarily on termites. This specialization has driven a sui...
null
399
true
aardwolf
aardwolf
tier4
simplex
grade_5
plain
The aardwolf is a small or medium-sized meat-eating animal from Africa. It belongs to the hyena family but is not a bone-crushing hyena. It mainly eats termites, using a long, sticky tongue to collect them. This helps control termite numbers in grasslands and dry places. Aardwolves live in scattered areas across southe...
5.38
265
false
aardwolf
aardwolf
tier4
simplex
college
plain
The aardwolf (Proteles cristatus) is a small to medium-sized African carnivore and a distinctive member of the hyena family, Hyaenidae. Unlike its larger relatives, which can crush and digest bones, it feeds almost entirely on termites. This specialization has produced anatomical and behavioral adaptations that make th...
13.49
335
false
aare
aare
tier4
proper_noun
neutral
plain
aare In the study of language and culture, the word aare operates as a compact exemplar of how a single term can carry literal and figurative weight across communities. In Estonian, where the form is used as a common noun, aare translates as treasure — a tangible object of value and a focal point of material culture. ...
null
394
true
aare
aare
tier4
proper_noun
grade_5
plain
Aare is an Estonian word that means treasure. It names something valuable that people can own. The word can also mean a special person, object, or useful thing. This shows polysemy, which means one word has several related meanings. Aare belongs to a family of old Finnic words. Finnish has a similar word, aarre. These ...
6.19
248
false
aare
aare
tier4
proper_noun
college
plain
In the study of language and culture, aare provides a concise example of how one term can carry both literal and figurative significance across communities. In Estonian, it is a common noun meaning “treasure”: a materially valuable object and a significant element of material culture. Beyond this denotation, the term e...
15.6
337
false
aargau
aargau
tier4
proper_noun
neutral
plain
Aargau is a canton in northern Switzerland, named after the River Aare (Aare-Gau, “Aare district”). Situated between the Swiss Plateau and the Jura Mountains, it borders the cantons of Zurich, Zug, Lucerne, Bern, Solothurn, Basel-Landschaft and Basel-Stadt, as well as Germany to the north across the Rhine. Its capital ...
null
218
true
aargau
aargau
tier4
proper_noun
grade_5
plain
Aargau is a canton, or a region with its own government, in northern Switzerland. Its name comes from the Aare River and means “Aare district.” It lies between the Swiss Plateau and the Jura Mountains. It touches Zurich, Zug, Lucerne, Bern, Solothurn, Basel-Landschaft, and Basel-Stadt. Germany lies north of it, across ...
7.59
186
false
aargau
aargau
tier4
proper_noun
college
plain
Aargau is a canton in northern Switzerland, named for the Aare River; Aare-Gau means “Aare district.” It occupies the ground between the Swiss Plateau and the Jura Mountains, bordering Zurich, Zug, Lucerne, Bern, Solothurn, Basel-Landschaft, Basel-Stadt, and Germany across the Rhine. Aarau, the capital, serves as a sig...
13.52
204
false
aarhus
aarhus
tier4
proper_noun
neutral
plain
Aarhus Aarhus is a major Danish city situated on the east coast of the Jutland Peninsula. As Denmark’s second-largest urban center, it functions as a cultural, educational, and economic hub that blends centuries of heritage with contemporary innovation. The city lies at roughly 56.1569° N, 10.2107° E, anchoring a dyna...
null
385
true
aarhus
aarhus
tier4
proper_noun
grade_5
plain
Aarhus is a large Danish city on Jutland’s east coast. It is Denmark’s second-largest city. It is a center for culture, learning, and business. Old buildings stand beside new ideas and technology. Aarhus lies near 56.1569 degrees north and 10.2107 degrees east. The city has a modern world-facing image and a strong Nord...
7.14
343
false
aarhus
aarhus
tier4
proper_noun
college
plain
Aarhus is a major Danish city on the eastern coast of the Jutland Peninsula. Denmark’s second-largest urban center, it serves as a cultural, educational, and economic hub where historical continuity meets contemporary innovation. The city lies at approximately 56.1569° N, 10.2107° E, and anchors a region that presents ...
15.82
357
false
aaron
aaron
core
proper_noun
neutral
plain
Aaron Aaron is a name of enduring prominence in religious, literary, and secular contexts. Grounded in the Hebrew Aharon (transliterated as Aharon), the etymology is often associated with notions of elevation, exaltation, or a lofty place, though scholarly debates persist over the precise root meaning. In scriptural a...
null
364
true
aaron
aaron
core
proper_noun
grade_1
plain
Aaron is an old name from the Bible. It is still used today. The name came from Aharon in Hebrew. Its old meaning may be high or lifted up. No one knows its first meaning for sure. Aaron can also be Aron or Aharon. Some languages write it as Aarón. Aaron was Moses' older brother. He was the first high priest of Israel....
2.66
129
false
aaron
aaron
core
proper_noun
grade_5
plain
Aaron is a long-standing name used in religion, literature, and everyday life. It comes from the Hebrew name Aharon. Its meaning may involve height or honor, but its exact root remains uncertain. Other forms include Aron, Aharon, and Aarón. Aaron was Moses' older brother and Israel's first High Priest. His family carri...
7.69
112
false
aaron
aaron
core
proper_noun
grade_10
plain
Aaron has remained an important name in religious, literary, and secular settings. It derives from the Hebrew Aharon, although scholars still debate the name's original root. Proposed meanings include elevation, exaltation, and a lofty place. In biblical and cultural traditions, Aaron often represents leadership, pries...
12.21
324
false
aaron
aaron
core
proper_noun
college
plain
Aaron is a name of sustained prominence across religious, literary, and secular domains. It derives from the Hebrew Aharon, although the precise etymological root remains disputed. Proposed interpretations associate the name with elevation, exaltation, or a high place. Within scriptural and cultural traditions, Aaron c...
15.08
339
false
aas
aas
tier4
proper_noun
neutral
plain
aas The string "aas" serves as a compact symbol that embodies polysemy across academic domains. In isolation it does not denote a single concept; rather, it signals a set of distinct meanings that vary with disciplinary context. This ambiguity highlights a central challenge in scholarly communication: how to manage ac...
null
375
true
aas
aas
tier4
proper_noun
grade_5
plain
AAS can mean several things in school and research. Its meaning depends on the subject. This can confuse readers. Writers should explain short forms when they first use them. This example shows why clear words and signs matter across subjects and cultures. Atomic absorption spectroscopy is a test that measures light ab...
7.46
325
false
aas
aas
tier4
proper_noun
college
plain
The string “aas” is a compact form with several established meanings across academic fields. On its own, it does not identify one subject or concept. Its interpretation depends on disciplinary context, making it a useful example of ambiguity in scholarly communication. Studying AAS draws attention to the wider problems...
15.63
359
false
aave
aave
tier4
proper_noun
neutral
plain
Aave is a decentralized finance (DeFi) protocol designed for lending and borrowing of digital assets in a trustless, permissionless environment. Originating on Ethereum and subsequently deployed across multiple networks, Aave pools user deposits to provide liquidity and enable borrowers to access capital without tradit...
null
397
true
aave
aave
tier4
proper_noun
grade_5
plain
Aave is a DeFi system for lending and borrowing digital money. It works without a bank or a person giving permission. It began on Ethereum and later moved to other networks. People put assets into shared pools, which let other people borrow them. The AAVE token helps users make decisions about the system. It also helps...
8.32
425
false
aave
aave
tier4
proper_noun
college
plain
Aave is a decentralized-finance protocol for lending and borrowing digital assets without relying on a traditional intermediary or requiring permission from a central authority. It originated on Ethereum and was later deployed across multiple networks. Users deposit assets into shared liquidity pools, allowing borrower...
14.21
435
false
aba
aba
tier2
simplex
neutral
plain
Aba is a term used in English primarily to denote a traditional outer garment of the Middle East and parts of North Africa. The garment, commonly rendered in Arabic as ʿabāʾ or ʿabāya, is typically a long, loose, and open-fronted cloak worn over other clothing. Historically, abas have been made from heavy woven materia...
null
206
true
aba
aba
tier2
simplex
grade_5
plain
An aba is a traditional outer coat from the Middle East and parts of North Africa. In Arabic, people call it an abaya. It is long, loose, and open in front. People wear it over other clothes. In the past, makers used camel hair, goat hair, or rough wool. These thick fabrics protected people from sun, wind, and cold nig...
6.8
158
false
aba
aba
tier2
simplex
college
plain
Aba is an English term chiefly referring to a traditional outer garment from the Middle East and parts of North Africa. In Arabic, related forms are commonly transliterated as ʿabāʾ or ʿabāya. The garment is generally a long, loose, open-fronted cloak worn over other clothing. Historically, it was woven from substantia...
14.37
188
false
aback
aback
tier2
simplex
neutral
plain
aback is a term with a dual life in English, spanning literal nautical usage and extended metaphorical meaning. In its nautical sense, to be aback describes a vessel whose sails are backed against the wind, producing back pressure that slows or reverses forward motion. In general speech, the phrase taken aback signals ...
null
322
true
aback
aback
tier2
simplex
grade_5
plain
Aback has two main uses in English: one on ships and one about surprise. At sea, aback means wind pushes a ship’s sails the wrong way. This pressure can slow the ship or make it move backward. In everyday talk, taken aback means suddenly surprised by news or events. This use carries the old sailing idea into thoughts a...
6.38
187
false
aback
aback
tier2
simplex
college
plain
Aback has two related lives in English: a literal nautical use and a figurative use associated with surprise. In nautical terminology, a vessel is aback when its sails are backed against the wind, so that the resulting pressure checks or reverses its forward motion. In general usage, however, the phrase taken aback des...
15.41
297
false
abactinal
abactinal
tier4
simplex
neutral
plain
abactinal is an anatomical descriptor used in echinoderm biology to denote the surface opposite the mouth-bearing side. In most echinoderms—especially starfishes (Asteroidea) and sea urchins (Echinoidea)—the body presents two principal surfaces: the actinal (oral) surface and the abactinal (aboral) surface. The term co...
null
326
true
abactinal
abactinal
tier4
simplex
grade_5
plain
Abactinal describes the body side away from an animal’s mouth. Echinoderms, which include starfish and sea urchins, have two main sides. The actinal side has the mouth, while the abactinal side does not. This difference helps scientists study how these animals eat, move, protect themselves, and sense their surroundings...
8.37
224
false
End of preview. Expand in Data Studio

OpenGloss v2.1 — Encyclopedia

The long-form entry-level prose of OpenGloss v2.1, one row per rendition. The encyclopedia config holds the 300–500-word article about each headword, written at up to five reading levels; the explanation config holds the shorter "why this word" lexical explanation. Both are entry-level: they are about the headword as a whole and are never a stand-in for one sense of a polysemous entry (D-71). Etymology has its own repo, opengloss-v2.1-etymology.

Part of the OpenGloss v2.1 release family — 16 datasets built from one store of 109,633 lexemes and 250,003 live senses, all joinable on derived ids. See Related datasets for the rest.

What's new in v2.1 vs v1.3

  1. Schema v3. Every lexeme carries a kind discriminator (simplex, compound, phrasal verb, idiom, proper noun, abbreviation, affix, function word); every sense carries a controlled domain leaf from a fixed ~160-leaf taxonomy instead of free text; every example carries the character span of the headword occurrence inside it.
  2. Renditions, not one string. A definition is a set: the canonical one plus rewrites at four reading levels and in four registers, each produced in a single call from the canonical text so they say the same thing at different altitudes.
  3. A sense graph, not a word graph. Typed relations resolve to sense ids wherever the target's entry exists in the release, so bank --hypernym--> financial institution points at a meaning rather than at a string.
  4. Retrieval data is first-class. Synthetic per-sense queries in eight styles, grounded QA pairs, mined word-in-context pairs, MS MARCO-style triples with graph-derived hard negatives, and graded TREC qrels — all derivable from, and consistent with, the same entries.
  5. Derivable identifiers everywhere. v1.3 published a positional id for lexemes and senses (3d_model_noun_0) and nothing below that. v2.1 gives every rendition, edge, query, QA pair and provenance record an id computable from the row alone, and never renumbers: a retired sense is tombstoned, so the ids after it keep their meaning.
  6. Per-field provenance. Which model wrote a field, how many tokens it took, what it cost — published as its own dataset.

What changed since v2.0

v2.0 (2026-09-05) covered the frequency-ranked single words. v2.1 adds tier 4: the function words the core ranking had excluded on purpose, and every remaining v1.3 entry at Wikipedia frequency ≥ 10 — mostly multiword compounds ("natural selection", "catalog number"), plus names and rarer single words. That doubles the lexeme count and changes the mix: v2.0 was 99.8% single words; a third of v2.1 is multiword.

v2.0 (2026-09-05) v2.1 (2026-09-07)
Lexemes 54,724 109,633
Live senses 137,314 250,003
Multiword entries (compounds, phrasal verbs, idioms) 86 36,366
Proper nouns 10,365 17,073
Function words 114 462
Gloss renditions 1,129,975 1,684,865
Example sentences 1,398,297 2,163,329
Live relations 735,318 1,574,438
Synthetic queries 1,330,311 1,304,650
QA pairs 750,348 736,010
Pretraining documents 617,175 1,111,044
Pretraining words 196,390,946 331,888,239
Pretraining tokens (cl100k_base) 275,659,096 471,451,693
Judge score, Opus, 40-entry samples 70.2 (core + tier 2), 66.7 (tier 3) 70.2 (core + tier 2), 66.7 (tier 3), 67.0 (tier 4)

Schema. No column was added, removed or retyped in any existing dataset. Three things did change:

  • tier gains the value tier4 (it was core, tier2 or tier3).
  • One new dataset, opengloss-v2.1-inflections: a flat surface-form → lemma lookup (plural, past tense, participles, comparative, superlative, derivations) built from the morphology that the lexicon already carried nested.
  • New provenance note prefixes on tombstones and edges, all reversible and all counted in the store audit: phantom_pos: (a v1.3 part-of-speech block whose glosses defined a component word rather than the compound — 11,440 blocks retired), regen: (relations regenerated for senses that had lost every edge to judging), and retyped: contrast (synonym edges the contrast paragraphs showed to be hypernym or hyponym).

Not row-compatible with v2.0. Lexeme, sense, rendition, edge, query and QA ids are stable for every entry v2.0 had. The derived training sets (retrieval-pairs, retrieval-triples, qrels) re-sample negatives over the larger pool, so their rows differ; and the store-wide quality passes run for v2.1 retired ~3,000 senses of the v2.0 entries (phantom part-of-speech blocks and near-duplicate senses), so those senses are now tombstoned rather than live. Treat v2.1 as a new release, not a delta.

Scope: fewer headwords, far more per headword

v2.1 is not a superset of v1.3. It covers 109,633 of v1.3's 205,988 lexemes — every frequency-ranked single word, plus the compounds and names at Wikipedia frequency ≥ 10 — and spends the difference on depth. If you need breadth of vocabulary, use v1.3; if you need graded renditions, resolved relations, spans, or retrieval supervision, use v2.1.

v1.3 v2.1
Lexemes 205,988 109,633
Senses 565,604 250,003
Definition renditions per sense 1 canonical 1 canonical + up to 8 graded
Relation targets bare strings resolved to sense ids
Retrieval training data companion sets queries, QA, triples, qrels
Per-field provenance no model, tokens and cost per call

Key statistics

Lexemes 109,633
Live senses 250,003
Rows in this dataset 458,532
Encyclopedia renditions 348,899
Lexical explanations 109,633
Mean article length 295 words

By tier

  • core — top 10K by composite frequency
  • tier2 — ranks to ~42K
  • tier3 — the rest of the frequency-ranked single words
  • tier4 — stopwords, plus compounds and names at Wikipedia frequency ≥ 10
Tier Lexemes Live senses
core 10,000 33,405
tier2 31,886 75,326
tier3 12,838 25,593
tier4 54,909 115,679

Coverage by tier

The release was built in 4 frequency-ranked passes (core, tier2, tier3 and tier4) and they did not all receive the same stages. This table is per-field and per-tier so the gaps are visible rather than averaged away.

Field Of core tier2 tier3 tier4
Canonical gloss sense 100.0% 100.0% 100.0% 100.0%
Controlled domain tag sense 100.0% 100.0% 100.0% 100.0%
Gloss at 4 reading levels sense 100.0% 99.9% 99.9% 100.0%
Gloss in 4 registers sense 100.0% 100.0% 0.0% 0.0%
At least one example sense 100.0% 99.9% 99.8% 99.5%
Examples at 4 reading levels sense 99.0% 99.6% 99.7% 99.5%
At least one relation sense 99.4% 99.2% 99.3% 99.2%
Synthetic retrieval queries sense 100.0% 100.0% 0.0% 0.0%
Grounded QA pairs sense 99.8% 99.6% 0.0% 0.0%
Etymology lexeme 100.0% 100.0% 99.8% 100.0%
Lexical explanation lexeme 100.0% 100.0% 100.0% 100.0%
Encyclopedia (neutral) lexeme 100.0% 100.0% 100.0% 100.0%
Encyclopedia at grade 5 + college (core entries also carry grade 1 and grade 10) lexeme 100.0% 100.0% 100.0% 100.0%
Contrast paragraphs lexeme 72.8% 55.1% 0.0% 0.0%

Files

Files Config Rows Shards Size
data/encyclopedia/train-*.parquet encyclopedia 348,899 1 232.1 MB
data/explanation/train-*.parquet explanation 109,633 1 39.4 MB

Fields

Config encyclopedia

348,899 rows, one row per encyclopedia rendition.

Field Type Description
lexeme_id string Entry id: slugify(headword). Join key across the family.
headword string The entry's surface headword.
tier string core (top 10K by composite frequency), tier2 (ranks to ~42K), tier3 (the rest of the frequency-ranked single words), tier4 (stopwords, plus compounds and names at Wikipedia frequency ≥ 10) or unknown (on none of the rank lists); an export may contain only some of these — see the coverage table.
kind string The entry's lexeme kind.
reading_level string The rendition's reading level.
register string The rendition's register.
text string The article or explanation at this (reading level, register).
readability_grade double Measured Flesch-Kincaid grade, when recorded.
n_words int32 Whitespace-delimited word count of text.
is_canonical bool True for the (neutral, plain) rendition.

One real row:

{
  "lexeme_id": "a",
  "headword": "a",
  "tier": "tier4",
  "kind": "function_word",
  "reading_level": "neutral",
  "register": "plain",
  "text": "The word a functions primarily as an indefinite article in English, signaling non-specific reference. It is also the name of the first letter of the alphabet, written as both A (uppercase) and a (lowercase). The indefinite article helps learners mark a noun as one member of a class rather than a particular instance, en … [truncated for this card]",
  "readability_grade": null,
  "n_words": 480,
  "is_canonical": true
}

Config explanation

109,633 rows, one row per lexical-explanation rendition.

Field Type Description
lexeme_id string Entry id: slugify(headword). Join key across the family.
headword string The entry's surface headword.
tier string core (top 10K by composite frequency), tier2 (ranks to ~42K), tier3 (the rest of the frequency-ranked single words), tier4 (stopwords, plus compounds and names at Wikipedia frequency ≥ 10) or unknown (on none of the rank lists); an export may contain only some of these — see the coverage table.
kind string The entry's lexeme kind.
reading_level string The rendition's reading level.
register string The rendition's register.
text string The article or explanation at this (reading level, register).
readability_grade double Measured Flesch-Kincaid grade, when recorded.
n_words int32 Whitespace-delimited word count of text.
is_canonical bool True for the (neutral, plain) rendition.

One real row:

{
  "lexeme_id": "a",
  "headword": "a",
  "tier": "tier4",
  "kind": "function_word",
  "reading_level": "neutral",
  "register": "plain",
  "text": "A is the indefinite article used before a singular count noun to indicate a non-specific member of a group, as in “a book” or “a teacher.” It signals that the noun refers to one example of a class rather than a particular, previously identified item. In this function, it contrasts with the definite article “the,” which … [truncated for this card]",
  "readability_grade": null,
  "n_words": 161,
  "is_canonical": true
}

Loading it

from datasets import load_dataset

# configs: "encyclopedia", "explanation"
ds = load_dataset("mjbommar/opengloss-v2.1-encyclopedia", "encyclopedia", split="train")
print(ds)
print(ds[0])

The shards are plain parquet, so nothing forces you through datasets — read them straight, locally or over hf://:

import polars as pl

df = pl.read_parquet("hf://datasets/mjbommar/opengloss-v2.1-encyclopedia/data/encyclopedia/train-*.parquet")
print(df.head())
import duckdb

duckdb.sql("SELECT count(*) FROM 'hf://datasets/mjbommar/opengloss-v2.1-encyclopedia/data/encyclopedia/train-*.parquet'").show()

The same article at five reading levels

from datasets import load_dataset

enc = load_dataset("mjbommar/opengloss-v2.1-encyclopedia", "encyclopedia", split="train")
one = enc.filter(lambda row: row["lexeme_id"] == "abseil")
for row in sorted(one, key=lambda r: r["reading_level"]):
    print(row["reading_level"], "-", row["n_words"], "words")
    print(row["text"][:200], "...\n")

Identifiers, and how they compose

Every id is derived from structure, never randomly minted, so a consumer can recompute one from a row and join across the whole family without a lookup table. Sense positions are stable across regenerations: a retired sense is tombstoned, not removed, so the indices after it never shift.

Id Shape Example
Lexeme slugify(headword) abseil
Sense {lexeme_id}:{pos}:{index} (zero-based) abseil:verb:0
Rendition {owner_id}#{reading_level}/{register} abseil:verb:0#grade_5/plain
Entry-level owner {lexeme_id}:encyclopedia / :explanation abseil:encyclopedia
Edge {source_sense_id}-{type}->{target_lexeme_id} abseil:verb:0-synonym->rappel
Query {sense_id}#q{n} (zero-based) abseil:verb:0#q3
QA pair {sense_id}#qa{n} (zero-based) abseil:verb:0#qa3
Provenance record p{n} within its entry (one-based) p12

An edge id keys on the target's slug, not on the target's sense, so resolving a target never changes the id of the edge that found it.

Reading levels and registers

A rendition is keyed on a (reading_level, register) pair. The canonical rendition of every field is (neutral, plain); everything else is a rewrite of it.

reading_level Who it is written for Rough CCSS band
neutral The canonical text: an adult general reader, no level targeted
grade_1 Beginning readers; short sentences, common words K–1
grade_5 Upper elementary 4–5
grade_10 Secondary 9–10
college Undergraduate and above; technical vocabulary allowed 11–CCR
register What changes Reading it
plain Nothing — the neutral register The default
informal Conversational, contractions, everyday words How you'd say it to a friend
formal Full forms, precise hedging, no contractions How you'd write it in a report
technical Domain vocabulary, exact conditions How a specialist would state it
marketing Benefit-first, persuasive framing A genre, not a formality level

marketing sits on the register axis for convenience but is a genre value rather than a point on the formality scale — worth remembering if you train a formality classifier on this column.

Related datasets

Everything below is built from the same store and joins on lexeme_id / sense_id.

Dataset Grain What it holds
opengloss-v2.1-lexicon one row per lexeme One row per lexeme: kind, morphology, etymology, encyclopedia, contrasts, sense ids, provenance summary.
opengloss-v2.1-senses one row per live sense One row per live sense: canonical gloss, 8 gloss renditions, examples, resolved relations, synthetic queries, grounded QA pairs.
opengloss-v2.1-definitions one row per gloss rendition One row per gloss rendition (canonical included): reading level, register, text, readability grade.
opengloss-v2.1-examples one row per example rendition One row per example sentence with the headword's character span, its reading level and register.
opengloss-v2.1-encyclopedia (this one) one row per encyclopedia rendition · one row per lexical-explanation rendition One row per encyclopedia article rendition, plus an explanation config for the "why this word" prose.
opengloss-v2.1-etymology one row per entry with an etymology One row per entry with an etymology: prose summary, ordered language trail, cognates, references.
opengloss-v2.1-inflections one row per inflected, derived or lemma form One row per inflected or derived form, plus the lemma itself: a flat form→lemma lookup.
opengloss-v2.1-relations one row per live relation edge · one row per removed relation edge One row per semantic edge, resolved to target sense ids; a tombstoned config recovers the edges the reconcile pass removed.
opengloss-v2.1-queries one row per synthetic query One row per synthetic retrieval query, across eight query styles, tagged to the sense it should retrieve.
opengloss-v2.1-qa-pairs one row per question/answer pair One row per grounded question/answer pair, with the rendition ids the answer cites.
opengloss-v2.1-contrasts one row per contrast paragraph One row per "X vs Y" paragraph on a synonym/antonym/confusable edge, with a verdict on the edge.
opengloss-v2.1-provenance one row per provenance record One row per recorded generation call: stage, model, tokens, cost, run id — the audit trail.
opengloss-v2.1-retrieval-pairs one row per mined pair Word-in-context and doc2query-shaped (text_a, text_b, label) pairs mined from the store for free.
opengloss-v2.1-retrieval-triples one row per (query, positive, negative) triple MS MARCO-style (query, positive, negative) triples whose hard negatives come from the graph.
opengloss-v2.1-qrels one row per query, with its whole graded candidate list · one row per document in the retrieval corpus Graded TREC relevance judgements (0–3) plus the document corpus and listwise candidate lists.
opengloss-v2.1-pretrain one row per rendered document Entries serialised into plain-prose dictionary, thesaurus, encyclopedia and usage-note documents.

Known limitations

  • It is synthetic. Every string here was written by a language model against a schema, not transcribed from a corpus or checked by a lexicographer. It is well-formed and internally consistent; it is not attested usage, and it will contain confident errors. Do not use it as ground truth about what a word means.
  • Judge scores 70.2/100 (core + tier 2) and 66.7/100 (tier 3). A different model family (Claude Opus) scored fixed 40-entry stratified samples at the close of each build. Sample statistics, not per-entry guarantees, and the judge is itself a model.
  • Relation precision is the weakest axis. Relations were judged for validity and the ones that failed were demoted rather than asserted; symmetric reciprocity finished at 94.3% for synonyms and 95.3% for antonyms, and 1,890 senses were left with no relation at all. Treat a single edge as a hypothesis, not a fact; treat the aggregate graph as usable.
  • core, tier2, tier3 and tier4 are deliberately partial. 109,633 lexemes across core, tier2, tier3 and tier4 received the text stages (glosses, examples, encyclopedia) but not the queries, QA pairs, contrasts or register renditions. The coverage table above gives the exact per-field share; nothing is hidden behind an average.
  • The encyclopedia is entry-level. One article per headword, about the headword as a whole. On a polysemous entry it is not a description of any one sense, and it is never used as a positive for one (D-71). It is entry-level reference prose, not a specialist article.

Citation

@misc{bommarito2025opengloss,
  title  = {OpenGloss: A Synthetic Encyclopedic Dictionary and Semantic Knowledge Graph},
  author = {Bommarito, Michael J., II},
  year   = {2025},
  eprint = {2511.18622},
  archivePrefix = {arXiv},
  url    = {https://arxiv.org/abs/2511.18622}
}

License

Released under Creative Commons Attribution 4.0 International (CC-BY 4.0). Attribution to the OpenGloss project is required; commercial use is permitted.

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