# delta
## Translingual
### Noun

delta
* Alternative letter-case form of Delta of the ICAO/NATO radiotelephony alphabet.

## English
### Etymology

From Ancient Greek δέλτα (délta), borrowed from a Phoenician word for "door", ultimately from Proto-Semitic *dalt-. Doublet of dalet.
* (river): from the triangular shape of the majuscule Greek letter delta Δ
* (USSF): from the delta wing, symbol of the USSF, a triangular wing, shaped like the majuscule Greek letter delta Δ

### Pronunciation

* IPA: /ˈdɛltə/, [ˈdɛɫtə]
* Audio (US):(file)
* Rhymes: -ɛltə

### Noun

delta (plural deltas)
* The fourth letter of the modern Greek alphabet Δ, δ.
* A landform at the mouth of a river where it empties into a body of water.
    Nile Delta
* (international standards) Alternative letter-case form of Delta from the NATO/ICAO Phonetic Alphabet.
* (mathematics, physics, engineering) The symbol Δ; A change in a quantity, likely from "d" for "difference".
    ΔV - "delta vee"(change in velocity, used in rocketry and orbital mechanics)
* (finance) The rate of change in an option value with respect to the underlying asset's price.
* (chemistry) A value in delta notation indicating the relative abundances of isotopes.
* (computing) The set of differences between two versions of a file.
    When you update the file, the system will only save the deltas.
* (computing, informal) A small but noticeable effect. Compare epsilon.
    This will slow the main code path down, but only by delta.
* (surveying) The angle subtended at the center of a circular arc.
* A type of cargo bike that has one wheel in front and two in back.
* (electrical, often attributive) The closed figure produced by connecting three coils or circuits successively, end for end, especially in a three-phase system.
    delta winding; delta connection; delta current
* (US, military, U.S. Space Force) A military unit, nominally headed by a colonel, equivalent to a USAF operations wing, or an army regiment.
* (astronomy) a star that is usually the fourth brightest of a constellation.
* (physics) one of four baryons consisting of up and down quarks with a combined spin of 3/2: Δ$^{++}$ (uuu), Δ$^+$ (uud), Δ$^0$ (udd), or Δ$^−$ (ddd)
* (medicine) Short for delta variant. (variant of the SARS-CoV-2 virus)

#### Synonyms

* (USSF): garrison (a support wing equivalent)

#### Hypernyms

* (measure of derivative price sensitivity): Greeks (includes list of coordinate terms)
* (particle physics): baryon; resonance

#### Derived terms

* antidelta
* correlation delta
* delta acid
* delta blues
* delta cell
* delta connection
* deltacoronavirus
* Delta County
* deltacron
* delta decay
* delta female
* deltaform
* delta glider
* delta hinge
* deltaic
* delta iron
* deltal
* delta male
* delta metal
* delta particle
* delta ray
* delta-sigma converter
* delta strain
* deltate
* delta test
* delta-v
* delta variant
* delta wing
* deltic
* Dirac delta
* Dirac delta function
* hepatitis delta virus
* inverted river delta
* Kronecker delta
* lava delta
* nondelta
* prodelta
* sigma-delta converter
* stimulus delta
* subdelta
* theta-delta

#### Related terms

* deltoid

#### Translations

    The translations below need to be checked and inserted above into the appropriate translation tables. See instructions at Wiktionary:Entry layout § Translations.

#### See also

* (Greek-script letter names) alpha, beta, gamma, delta, epsilon, zeta, eta, theta, iota, kappa, lambda, mu, nu, xi, omicron, pi, rho, sigma, tau, upsilon, phi, chi, psi, omega

### Verb

delta (third-person singular simple present deltas, present participle deltaing, simple past and past participle deltaed)
* (cryptography) To calculate the differences between the characters in an enciphered text and the characters a fixed number of positions previous.
** 2007, B. J. Copeland, “Tunny and Colossus: Breaking the Lorenz Schlüsselzusatz traffic”, in Karl de Leeuw, Jan Bergstra, editors, The History of Information Security: A Comprehensive Handbook, Amsterdam: Elsevier, →ISBN, page 458:Turingery worked on deltaed key to produce the deltaed contribution of the chi-wheels. Turing's discovery that delta-ing would reveal information otherwise hidden was essential to the developments that followed.
* (computing) To compare two versions of the same file in order to determine where they differ (where a programmer has made edits).
** 1992, Israel Silverberg, Source File Management With SCCS, Englewood Cliffs, NJ: Prentice Hall, →ISBN, page 166:The primary function of this command is to delta the product version file (if it has been retrieved for edit). However, prior to deltaing the product version file, the work source tree is searched to verify that no other source files are still waiting to be deltaed.

### Anagrams

* atled, Tedla, lated, Adlet, dealt, dalet, adlet, taled

## Asturian
### Etymology

From Ancient Greek δέλτα (délta).

### Noun

delta f (plural deltes)
* delta (Greek letter)

### Noun

delta m (plural deltes)
* delta (landform at the mouth of a river)

## Catalan
### Etymology

Borrowed from Ancient Greek δέλτα (délta).

### Pronunciation

* IPA: (Central, Balearic) [ˈdɛl.tə]
* IPA: (Valencia) [ˈdel.ta]

### Noun

delta f (plural deltes)
* delta; the Greek letter Δ (lowercase δ)
* (geography) a delta

#### Derived terms

* metall delta

## Czech

Greek letter :
| Δδ | Previous: | gama |
| Δδ | Next: | epsilon |

### Pronunciation

* IPA: [ˈdɛlta]

### Etymology 1

Borrowed from Ancient Greek δέλτα (délta), which is probably of Semitic origin.

#### Noun

delta n (indeclinable)
* Delta (Greek letter Δ)
* (physics) kind of rays consisting of secondary electrons with enough energy to escape a significant distance away from the primary radiation beam and produce further ionization (delta ray)

#### Adjective

delta (indeclinable)
* having the shape of the Greek letter Δ
    delta křídlo ― delta wing

### Etymology 2

Borrowed from Ancient Greek δέλτα (délta). Originally used for the delta of the Nile, because its forked shape resembled the Greek letter Δ. The word is probably of Semitic origin.

#### Noun

delta f (relational adjective deltový)
* (geography) delta (forked mouth of a river)

##### Declension
### References

* 1 2 Rejzek, Jiří (2015) “delta”, in Český etymologický slovník [Czech Etymological Dictionary] (in Czech), 3rd (revised and expanded) edition, Praha: LEDA, →ISBN, page 137

### Further reading

* “delta”, in Příruční slovník jazyka českého (in Czech), 1935–1957
* “delta”, in Slovník spisovného jazyka českého (in Czech), 1960–1971, 1989

### Anagrams

* datel
* datle

## Danish
### Etymology

From Ancient Greek δέλτα (délta).

### Noun

delta n (singular definite deltaet, plural indefinite deltaer)
* a river delta
* delta (the fourth letter of the Greek alphabet, Δ, δ.)

#### Declension
### References

* “delta” in Den Danske Ordbog

## Dutch
### Etymology

Ultimately from Ancient Greek δέλτα (délta). Doublet of dalet.

### Pronunciation

* IPA: /ˈdɛl.taː/
* Audio:(file)
* Hyphenation: del‧ta

### Noun

delta f (plural delta's, diminutive deltaatje n)
* the Greek letter delta
* a river delta, a network of one or more rivers and tributaries pouring out into a larger body of water
    Synonym: rivierdelta

#### Hypernyms

* mond
* monding
* riviermond
* riviermonding

#### Coordinate terms

* estuarium

#### Derived terms

* deltagebied
* Deltagebied
* Deltaplan
* Deltawerk
* rivierdelta

## Finnish

Greek letter :
| Δδ | Previous: | gamma |
| Δδ | Next: | epsilon |

### Etymology

From Ancient Greek δέλτα (délta).

### Pronunciation

* IPA: /ˈdelt(ː)ɑ/, [ˈde̞l̪t̪(ː)ɑ̝]
* Rhymes: -eltɑ
* Hyphenation: del‧ta

### Noun

delta
* delta (Greek letter)

#### Declension

Possessive forms of delta (Kotus type 9/kala, no gradation) :
first-person singular possessor
singular
plural
nominative
deltani
deltani
accusative
nom.
deltani
deltani
gen.
deltani
genitive
deltani
deltojeni deltaini $^{rare}$
partitive
deltaani
deltojani
inessive
deltassani
deltoissani
elative
deltastani
deltoistani
illative
deltaani
deltoihini
adessive
deltallani
deltoillani
ablative
deltaltani
deltoiltani
allative
deltalleni
deltoilleni
essive
deltanani
deltoinani
translative
deltakseni
deltoikseni
abessive
deltattani
deltoittani
instructive
comitative
—deltoineni
second-person singular possessor
singular
plural
nominative
deltasi
deltasi
accusative
nom.
deltasi
deltasi
gen.
deltasi
genitive
deltasi
deltojesi deltaisi $^{rare}$
partitive
deltaasi
deltojasi
inessive
deltassasi
deltoissasi
elative
deltastasi
deltoistasi
illative
deltaasi
deltoihisi
adessive
deltallasi
deltoillasi
ablative
deltaltasi
deltoiltasi
allative
deltallesi
deltoillesi
essive
deltanasi
deltoinasi
translative
deltaksesi
deltoiksesi
abessive
deltattasi
deltoittasi
instructive
comitative
—deltoinesi
first-person plural possessor
singular
plural
nominative
deltamme
deltamme
accusative
nom.
deltamme
deltamme
gen.
deltamme
genitive
deltamme
deltojemme deltaimme $^{rare}$
partitive
deltaamme
deltojamme
inessive
deltassamme
deltoissamme
elative
deltastamme
deltoistamme
illative
deltaamme
deltoihimme
adessive
deltallamme
deltoillamme
ablative
deltaltamme
deltoiltamme
allative
deltallemme
deltoillemme
essive
deltanamme
deltoinamme
translative
deltaksemme
deltoiksemme
abessive
deltattamme
deltoittamme
instructive
comitative
—deltoinemme
second-person plural possessor
singular
plural
nominative
deltanne
deltanne
accusative
nom.
deltanne
deltanne
gen.
deltanne
genitive
deltanne
deltojenne deltainne $^{rare}$
partitive
deltaanne
deltojanne
inessive
deltassanne
deltoissanne
elative
deltastanne
deltoistanne
illative
deltaanne
deltoihinne
adessive
deltallanne
deltoillanne
ablative
deltaltanne
deltoiltanne
allative
deltallenne
deltoillenne
essive
deltananne
deltoinanne
translative
deltaksenne
deltoiksenne
abessive
deltattanne
deltoittanne
instructive
comitative
—deltoinenne
third-person possessor
singular
plural
nominative
deltansa
deltansa
accusative
nom.
deltansa
deltansa
gen.
deltansa
genitive
deltansa
deltojensa deltainsa $^{rare}$
partitive
deltaansa
deltojaan deltojansa
inessive
deltassaan deltassansa
deltoissaan deltoissansa
elative
deltastaan deltastansa
deltoistaan deltoistansa
illative
deltaansa
deltoihinsa
adessive
deltallaan deltallansa
deltoillaan deltoillansa
ablative
deltaltaan deltaltansa
deltoiltaan deltoiltansa
allative
deltalleen deltallensa
deltoilleen deltoillensa
essive
deltanaan deltanansa
deltoinaan deltoinansa
translative
deltakseen deltaksensa
deltoikseen deltoiksensa
abessive
deltattaan deltattansa
deltoittaan deltoittansa
instructive
comitative
—deltoineen deltoinensa :

#### Derived terms

* deltafunktio
* deltalihas
* deltasiipi

#### See also

* suisto

### Further reading

* “delta”, in Kielitoimiston sanakirja [Dictionary of Contemporary Finnish]‎ (in Finnish) (online dictionary, continuously updated), Kotimaisten kielten keskuksen verkkojulkaisuja 35, Helsinki: Kotimaisten kielten tutkimuskeskus (Institute for the Languages of Finland), 2004–, retrieved 2023-07-02

### Anagrams

* dalet

## French
### Etymology

From Ancient Greek δέλτα (délta).

### Pronunciation

* IPA: /dɛl.ta/
* Audio:(file)

### Noun

delta m (plural delta or deltas)
* delta (Greek letter)

### Noun

delta m (plural deltas)
* delta (geographical feature)
    Hypernym: embouchure

### Further reading

* “delta”, in Trésor de la langue française informatisé [Digitized Treasury of the French Language], 2012.

## Galician
### Etymology

From Ancient Greek δέλτα (délta).

### Noun

delta m (plural deltas)
* delta (Greek letter)
* delta (landform at the mouth of a river)

## Hungarian
### Etymology

From Ancient Greek δέλτα (délta).

### Pronunciation

* IPA: [ˈdɛltɒ]
* Hyphenation: del‧ta
* Audio:(file)
* Rhymes: -tɒ

### Noun

delta (plural delták)
* delta (Greek letter)
* delta (landform at the mouth of a river)

#### Declension
### Further reading

* delta in Bárczi, Géza and László Országh. A magyar nyelv értelmező szótára (“The Explanatory Dictionary of the Hungarian Language”, abbr.: ÉrtSz.). Budapest: Akadémiai Kiadó, 1959–1962. Fifth ed., 1992: →ISBN
* delta in Nóra Ittzés, editor, A magyar nyelv nagyszótára [A Comprehensive Dictionary of the Hungarian Language] (Nszt.), Budapest: Akadémiai Kiadó, 2006–2031 (work in progress; published a–ez as of 2024).

## Icelandic
### Noun

delta f (genitive singular deltu, nominative plural deltur) or delta n (genitive singular delta, nominative plural deltu)
* delta (Greek letter)

#### Declension
## Indonesian
### Etymology

From Ancient Greek δέλτα (délta).

### Pronunciation

* IPA: [ˈdɛlta]
* Hyphenation: dèl‧ta

### Noun

delta
* delta,
** The fourth letter of the modern Greek alphabet Δ, δ.
** (geography) A landform at the mouth of a river where it empties into a body of water.

### Further reading

* “delta” in Kamus Besar Bahasa Indonesia, Jakarta: Agency for Language Development and Cultivation – Ministry of Education, Culture, Research, and Technology of the Republic of Indonesia, 2016.

## Italian
### Etymology

From Ancient Greek δέλτα (délta).

### Pronunciation

* IPA: /ˈdɛl.ta/
* Rhymes: -ɛlta
* Hyphenation: dèl‧ta

### Noun

delta m (invariable)
* delta (all senses)

#### Derived terms

* ala a delta
* deltaplano

### Anagrams

* dalet

## Latvian
### Noun

delta f (4th declension)
* delta (Greek letter)
* delta (landform at the mouth of a river)

#### Declension
## Norwegian Bokmål
### Etymology 1

From Ancient Greek δέλτα (délta).

#### Noun

delta m (definite singular deltaen, indefinite plural deltaer, definite plural deltaene)
* the Greek letter Δ, δ (delta)

### Etymology 2
#### Noun

delta n (definite singular deltaet, indefinite plural delta or deltaer, definite plural deltaene)
* a river delta

##### Derived terms

* elvedelta

### Etymology 3

From del (“part”) + ta (“take”); i.e. to take (a) part in something; to partake in something.

#### Verb

delta (imperative delta, present tense deltar, passive deltas, simple past deltok, past participle deltatt, present participle deltakende)
* to participate; to partake

##### Related terms

* deltagelse, deltakelse
* deltager, deltaker

### References

* “delta” in The Bokmål Dictionary.

## Norwegian Nynorsk
### Etymology 1

From del (“part”) + ta (“take”); i.e. to take (a) part in something.

#### Alternative forms

* deltaka, deltake (long forms)

#### Verb

delta (present tense deltek or deltar, past tense deltok, past participle delteke or deltatt, passive infinitive delteken, present participle deltakande, imperative delta)
* to participate

##### Related terms

* deltakar

### Etymology 2

From Ancient Greek δέλτα (délta).

#### Noun

delta m (definite singular deltaen, indefinite plural deltaer or deltaar, definite plural deltaene or deltaane)
* the Greek letter Δ, δ (delta)

### Etymology 3

A specialized use of delta (Etymology 2).

#### Noun

delta n (definite singular deltaet, indefinite plural delta, definite plural deltaa)
* a river delta

##### Derived terms

* elvedelta

### References

* “delta” in The Nynorsk Dictionary.

## Polish
### Etymology

Learned borrowing from Ancient Greek δέλτα (délta), from Phoenician 𐤃 (d /⁠dalet⁠/).

### Pronunciation

* IPA: /ˈdɛl.ta/
* Audio:(file)
* Rhymes: -ɛlta
* Syllabification: del‧ta

### Noun

delta f
* delta (Greek letter Δ, δ)
* (mathematics, colloquial) discriminant
    Synonym: wyróżnik
* (geography) delta (landform at the mouth of a river)
* (aeronautics) delta wing

#### Derived terms

* deltowy

### Further reading

* delta in Wielki słownik języka polskiego, Instytut Języka Polskiego PAN
* delta in Polish dictionaries at PWN

## Portuguese
### Etymology

Borrowed from Ancient Greek δέλτα (délta).

### Pronunciation

* (Brazil) IPA: /ˈdɛw.tɐ/ [ˈdɛʊ̯.tɐ]
* (Brazil) IPA: /ˈdɛw.tɐ/ [ˈdɛʊ̯.tɐ]
** (Southern Brazil) IPA: /ˈdɛw.ta/ [ˈdɛʊ̯.ta]
* (Portugal) IPA: /ˈdɛl.tɐ/ [ˈdɛɫ.tɐ]
* Hyphenation: del‧ta

### Noun

delta m (plural deltas)
* delta (Greek letter)
* delta (landform at the mouth of a river)

#### Derived terms

* asa-delta

## Serbo-Croatian
### Etymology

From Ancient Greek δέλτα (délta).

### Pronunciation

* IPA: /dêlta/
* Hyphenation: del‧ta

### Noun

dȅlta f (Cyrillic spelling де̏лта)
* delta, the Greek letter Δ, δ

#### Declension
## Spanish
### Etymology

Borrowed from Ancient Greek δέλτα (délta).

### Pronunciation

* IPA: /ˈdelta/ [ˈd̪el̪.t̪a]
* Rhymes: -elta
* Syllabification: del‧ta

### Noun

delta f (plural deltas)
* Greek letter delta

#### Derived terms

* ala delta

### Noun

delta m (plural deltas)
* (geography) a delta

#### Related terms

* deltaico

### Further reading

* “delta”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8, Royal Spanish Academy [Spanish: Real Academia Española], 2024 December 10

## Swahili
### Etymology

Borrowed from English delta.

### Pronunciation

* Audio (Kenya):(file)

### Noun

delta class IX (plural delta class X)
* delta (landform at the mouth of a river)

## Swedish
### Etymology 1

From Ancient Greek δέλτα (délta).

#### Noun

delta n
* the Greek letter Δ, δ (delta)
* a river delta

##### Declension
### Etymology 2

From del (“part”) +‎ ta(ga) (“take”), i.e. to take part in something. Compare English partake.

#### Alternative forms

* deltaga (dated)

#### Pronunciation

* Audio:(file)

#### Verb

delta (present deltar, preterite deltog, supine deltagit, imperative delta)
* to participate, to take part
    delta i en demonstrationparticipate in a demonstration (protest march)
** to attend
    Han deltog i mötetHe attended (took part in) the meeting

##### Conjugation

$^1$ Archaic. $^2$ Dated. See the appendix on Swedish verbs.

##### Related terms

* deltagare

### References

* delta in Svensk ordbok (SO)
* delta in Svenska Akademiens ordlista (SAOL)
* delta in Svenska Akademiens ordbok (SAOB)

### Anagrams

* delat, talde