noun
a word or thing that is third from the last in a series
adjective
referring to the third from the last in a series
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The antepenultimate chapter of the book is crucial to understanding the conclusion.
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I always forget what happens in the antepenultimate episode of the TV show.
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Dude, did you see the antepenultimate scene in that movie? It was insane!
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The antepenultimate step in achieving success is perseverance through challenges.