Etymology
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antepenultimate (adj.)

"the last but two," 1730, from antepenult (n.), 1610s, abbreviation of Latin antepænultima (syllaba) "last syllable but two in a word," from fem. of antepænultimus, from ante "before" (from PIE root *ant- "front, forehead," with derivatives meaning "in front of, before") + pænultima, from pæne "almost" (a word of uncertain origin) + ultima "last" (see ultimate).

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Definitions of antepenultimate
1
antepenultimate (n.)
the 3rd syllable of a word counting back from the end;
Synonyms: antepenult / antepenultima
2
antepenultimate (adj.)
third from last;
From wordnet.princeton.edu