antepenultimate
noun
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Two before the last in a series. e.g. (..., antepenultimate, penultimate, ultimate)
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The syllable that comes two before the last in a word.
"The words animal, citizen, comedy, dangerous, obvious, and antepenultimate are stressed on the antepenultimate."
adjective
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Two before the last, i.e., the one immediately before the penultimate, in a series.
"This book has ten chapters — chapter 8 is the antepenultimate one."
Synonyms:
peripenultimate, propenultimate, third last, third to last