Where does “avant-dernier” come from?

avant-dernier (French) comes from French dernier, from French derrenier, from Old French derrain, from Vulgar Latin deretranus, from Latin dē, from Latin post, from Latin poste, from Proto-Italic posti — afterwards, post; by, at.

avant-dernier (French): penultimate, second-to-last, last but one

Definitions

  1. penultimate, second-to-last, last but one

Ancestry of “avant-dernier”, step by step

avant-dernier traces back through two separate lines of ancestry.

via French dernier

StepLanguageWordMeaning
1Frenchdernierlast; latest; latter
2Frenchderrenier
3Old Frenchderrainfinal, last; last
4Vulgar Latinderetranusto hinder
5Latinof; concerning; about
6Latinpostbehind; after, since, besides, except; behind,...
7Latinposteablative singular of postis
8Proto-Italicpostibehind, after
9Proto-Indo-Europeanpóstiafter
10Proto-Indo-Europeanpósafterwards, post; by, at

via French avant

StepLanguageWordMeaning
1Frenchavantbeforehand; earlier
2Latinantebefore, in front, forwards; before; before,...
3Ancient Greekκλίσιςbending, inclination; a lying down; a place for...
4Ancient Greek-σῐς"suffix forming nouns"
5Ancient Greek-τιςretained after dentals
6Proto-Indo-European-tisDerives abstract/action nouns from verb roots
Every word from Proto-Indo-European pósEvery word from Proto-Indo-European póstiEvery word from Proto-Italic posti