The Longest English Word

Back in the eighteenth century, the word is said to have been invented as an erudite joke by students of the Eton College, who, upon consulting their Latin Grammar Textbook, found four ways of saying "don't care". In order, those were flocci facere, nauci facere, nihili facere, and pili facere (which sound like four of the seven dwarves, Roman version, but I digress). As a learned joke, somebody put all four of these together and then stuck –fication on the end to make a noun for the act of deciding that something is totally and absolutely valueless. It's one of the longest words in the English language. A quick Latin lesson:

1. Flocci facere (is from floccus, literally a tuft of wool and the source of English words like "fleece" and is related to the verb floccipendo which means, literally, "to give the value of a bit of fleece" or "to take lightly.")
2. Nauci facere (is from naucum, meaning "few" or "almost nothing.")
3. Nihili facere (is from ni+hilum, "not even a thread" or nothing; as in words like nihilism and annihilate)
4. Pili facere (is from pilus, a small hair, which we have inherited in words like depilatory, but which in Latin mean a trifle.)
5. Facere is from the verb facio meaning "to do" or "to make."
6. Tion" is a standard English nominalization form.
   

When put together, we get "the making light of a few trifles of nothing." Thus, the meaning of floccinaucinihilipilification becomes "the act of estimating something as worthless."

flɒksəˌnɔsəˌnaɪhɪləˌpɪləfɪˈkeɪʃən/ [flok-suh-naw-suh-nahy-hil-uh-pil-uh-fi-key-shuhn]

Of course, the word is often spelled with hyphens, and has even spawned the back formations floccinaucical (inconsiderable or trifling) and floccinaucity (the essence or quality of being of small importance). These can then be edited to form verbs, like floccinaucinihilipilificate, and adjectives, like floccinaucinihilipilificatious, or even other nouns, like floccinaucinihilipilificatism. When the common English nominal suffix -ness is then added to the above adjective, a thirty-four letter noun floccinaucinihilipilificatiousness is formed, which means "smallness" or "insignificance."

The next most commonly referred to long word, antidisestablishmentarianism, the ideology of being against the dissolution of the Church of England.

With 29 letters, it is the longest non-technical word. The word’s main function is to be trotted out as an example of a long word that can be used in everyday speech. Pneumonoultramicroscopicsilicovolcanoconiosis, the actual longest word is highly scientific and specific.
The first recorded use is by William Shenstone in a letter in 1741: “I loved him for nothing so much as his flocci-nauci-nihili-pili-fication of money”.

It had a rare public airing in 1999 when Senator Jesse Helms used it in commenting on the demise of the Comprehensive Test Ban Treaty: “I note your distress at my floccinaucinihilipilification of the CTBT”.

Lopado­temacho­selacho­gameo­kranio­leipsano­drim­hypo
trimmato­silphio­paraomelito­katakechymeno­kichl­e-
pi­kossypho­phatto­perister­alektryon­opte­ke
phallio­kinklo­peleio­lagoio­siraio­baphe­tragano­pterygon

Is the officially longest word, the name of a fictional dish mentioned in Aristophanes' comedy Assemblywomen. The original Greek spelling had 171 characters.

In the video below you could see a youngster twisting his tongue, trying to pronounce some of the longest words in English Language...
He's trying the following words. Repeat after him if you may please...

1. Taumatawhakatangihangakoauauotamateapoka iwhenuakitanatahu (See the photo on top, the name of a place in Newzealand!)
2. Pneumonoultramicroscopicsilicovolcanocon iosis
3. Floccinaucinihilipilification
4. Mamungkukumpurangkuntjunya Hill
5. Methionylthreonylthreonyl...isoleucine