Title: Longest word in English
Content:  The identity of the longest word in English depends upon the definition of what constitutes a word in the English language, as well as how length should be compared. Words may be derived naturally from the language's roots or formed by coinage and construction. Additionally, comparisons are complicated because place names may be considered words, technical terms may be arbitrarily long, and the addition of suffixes and prefixes may extend the length of words to create grammatically correct but unused or novel words. The length of a word may also be understood in multiple ways. Most commonly, length is based on orthography (conventional spelling rules) and counting the number of written letters. Alternate, but less common, approaches include phonology (the spoken language) and the number of phonemes (sounds).
Title: Longest word in English
Content:  The longest word in any of the major English language dictionaries is pneumonoultramicroscopicsilicovolcanoconiosis, a word that refers to a lung disease contracted from the inhalation of very fine silica particles, specifically from a volcano; medically, it is the same as silicosis. The word was deliberately coined to be the longest word in English, and has since been used in a close approximation of its originally intended meaning, lending at least some degree of validity to its claim. The Oxford English Dictionary contains pseudopseudohypoparathyroidism (30 letters). Merriam-Webster's Collegiate Dictionary does not contain antidisestablishmentarianism (28 letters), as the editors found no widespread, sustained usage of the word in its original meaning. The longest word in that dictionary is electroencephalographically (27 letters). The longest non-technical word in major dictionaries is floccinaucinihilipilification at 29 letters. Consisting of a series of 
Title: Longest words
Content:  The 45-letter word pneumonoultramicroscopicsilicovolcanoconiosis is the longest English word that appears in a major dictionary. Originally coined to become a candidate for the longest word in English, the term eventually developed some independent use in medicine. It is referred to as "P45" by researchers. floccinaucinihilipilification, at 29 letters and meaning the act of estimating something as being worth so little as to be practically valueless, or the habit of doing so, is the longest non-technical, coined word in Oxford Dictionaries of the English language. Antidisestablishmentarianism (word), at 28 letters, is the longest non-coined, non-systematic English word in Oxford Dictionaries. It refers to a 19th-century political movement that opposed the disestablishment of the Church of England as the state church of England.
Title: Longest word in English
Content: Schmaltzed and strengthed (10 letters) appear to be the longest monosyllabic words recorded in The Oxford English Dictionary, while scraunched and scroonched appear to be the longest monosyllabic words recorded in Webster's Third New International Dictionary; but squirrelled (11 letters) is the longest if pronounced as one syllable only (as permitted in The Shorter Oxford English Dictionary and Merriam-Webster Online Dictionary at squirrel, and in Longman Pronunciation Dictionary). Schtroumpfed (12 letters) was coined by Umberto Eco, while broughammed (11 letters) was coined by William Harmon after broughamed (10 letters) was coined by George Bernard Shaw. ; Strengths is the longest word in the English language containing only one vowel letter. ; Euouae, a medieval musical 
Title: Antidisestablishmentarianism (word)
Content:  The English word antidisestablishmentarianism (, also, US also ) is notable for its unusual length of 28 letters and 12 syllables, and is one of the longest words in the English language. It has been cited as the longest word in the English language (excluding coined and technical terms), although some dictionaries do not recognize it because of its low usage in everyday lexicon. The longest word found in a major dictionary is pneumonoultramicroscopicsilicovolcanoconiosis, but this is a technical term that was coined specifically to be the longest word. The word became known in the public realm in the United States via a popular television show in the 1950s, The $64,000 Question, when a young contestant correctly spelled it to win. A slightly longer but less commonly accepted variant can be found in the Duke Ellington song "You're Just an Old Antidisestablishmentarianismist".
Title: Longest word in English
Content:   The longest officially recognized place name in an English-speaking country is (57 letters), which is a hill in New Zealand. The name is in the Māori language. A longer and widely recognised version of the name is Taumatawhakatangihangakoauauotamateaturipukakapikimaungahoronukupokaiwhenuakitanatahu (85 letters), which appears on the signpost at the location (see the photo on this page). In Māori, the digraphs ng and wh are each treated as single letters. In Canada, the longest place name is Dysart, Dudley, Harcourt, Guilford, Harburn, Bruton, Havelock, Eyre and Clyde, a township in Ontario, at 61 letters or 68 non-space characters. The 58-letter name Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch is the name of a town on Anglesey, an island of 
Title: Longest word in English
Content:  billion letters long. The longest published word, Acetylseryltyrosylseryliso...serine, referring to the coat protein of a certain strain of tobacco mosaic virus, is 1,185 letters long, and appeared in the American Chemical Society's Chemical Abstracts Service in 1964 and 1966. In 1965, the Chemical Abstracts Service overhauled its naming system and started discouraging excessively long names. In 2011, a dictionary broke this record with a 1909-letter word describing the trpA protein. John Horton Conway and Landon Curt Noll developed an open-ended system for naming powers of 10, in which one , coming from the Latin name for 6560, is the name for 103(6560+1) = 1019683. Under the long number scale, it would be 106(6560) = 1039360.  is sometimes cited as the longest binomial name—it is a kind of amphipod. However, this 
Title: Longest word in English
Content:  is , a lake in Webster, Massachusetts. It means "Fishing Place at the Boundaries – Neutral Meeting Grounds" and is sometimes facetiously translated as "you fish your side of the water, I fish my side of the water, nobody fishes the middle". The lake is also known as Webster Lake. The longest hyphenated names in the U.S. are Winchester-on-the-Severn, a town in Maryland, and Washington-on-the-Brazos, a notable place in Texas history. The longest official geographical name in Australia is Mamungkukumpurangkuntjunya Hill. It has 26 letters and is a Pitjantjatjara word meaning "where the Devil urinates". In Ireland, the longest English place name at 19 letters is Newtownmountkennedy in County Wicklow.
Title: List of the longest English words with one syllable
Content:  This is a list of candidates for the longest English word of one syllable, i.e. monosyllables with the most letters. A list of 9,123 English monosyllables published in 1957 includes three ten-letter words: scraunched, scroonched, and squirreled. Guinness World Records lists scraunched and strengthed. Other sources include words as long or longer. Some candidates are questionable on grounds of spelling, pronunciation, or status as obsolete, nonstandard, proper noun, loanword, or nonce word. Thus, the definition of longest English word with one syllable is somewhat subjective, and there is no single unambiguously correct answer.
Title: Longest word in English
Content:  words meaning "nothing" and defined as "the act of estimating something as worthless"; its usage has been recorded as far back as 1741. Ross Eckler has noted that most of the longest English words are not likely to occur in general text, meaning non-technical present-day text seen by casual readers, in which the author did not specifically intend to use an unusually long word. According to Eckler, the longest words likely to be encountered in general text are deinstitutionalization and counterrevolutionaries, with 22 letters each. A computer study of over a million samples of normal English prose found that the longest word one is likely to encounter on an everyday basis is uncharacteristically, at 20 letters. The word internationalization is abbreviated "i18n", the embedded number representing the number of letters between the first and the last.

Question: what is the longest english word in the dictionary?
Answer: Methionylglutaminylarginyltyrosylglutamyl...serine.
pneumonoultramicroscopicsilicovolcanoconiosis.
Pneumonoultramicroscopicsilicovolcanoconiosis.