— sesquipedality /ses'kwi pi dal"i tee/ , sesquipedalianism, sesquipedalism /ses kwip"i dl iz'euhm, -kwi peed"l iz'euhm/ , n.
/ses'kwi pi day"lee euhn, -dayl"yeuhn/ , adj. Also, sesquipedal /ses kwip"i dl/ .
1. given to using long words.
2. (of a word) containing many syllables.
n.
3. a sesquipedalian word.
[ 1605-15; sesquipedalis measuring a foot and a half (see SESQUI-, PEDAL) + -AN ]