antepenultimate

not-comparable

Two before the last, i.e., the one immediately before the penultimate, in a series.

Japanese Meaning

倒数三番目 (シリーズの最後から数えて3番目) / 後ろから数えて3番目

She carefully removed the antepenultimate page from the manuscript to correct a small error.

彼女は原稿の最後から三番目のページを注意深く抜き取り、小さな誤りを訂正した。

Sense（1）

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.