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antidisestablishmentarianism
Antidisestablishmentarianism is almost never found in genuine use and is most often merely cited as an example of a very long word. Other similar curiosities are floccinaucinihilipilification and pneumonoultramicroscopicsilicovolcanoconiosis, the second being generally reckoned to be the longest word in any dictionary. The longest word to be encountered in Britain is the Welsh place name Llanfairpwllgwyngyllgogerychwyrndrobwllllantysiliogogogoch, which is generally abbreviated to Llanfair PG; this name was created in the 19th century.