Definition from Wiktionary, the free dictionary
sesquipedalianism (plural sesquipedalianisms)
- (uncountable) The practice of using long, sometimes obscure, words in speech or writing.
- (countable) A very long word.
- ^ From A New and Copious Lexicon of the Latin Language, Compiled Chiefly from the Magnum Totius Latinitatis Lexicon of Facciolati and Forcellini, and the German Works of Scheller and Luenemann, edited by F. P. Leverett, Wilkins, Carter & Co., Boston, 1849.