Where does “espousal” come from?

espousal (Middle English) comes from Old French espousailles, from Latin sponsalia, from Latin sponsalis, from Latin sponsa, from Latin sponsus, from Latin spondeo, from Proto-Italic spondeō, from Proto-Indo-European spondéyeti — to libate.

Ancestry of “espousal”, step by step

StepLanguageWordMeaning
1Old Frenchespousailles
2Latinsponsaliabetrothal, espousal; wedding
3Latinsponsalisof betrothal
4Latinsponsabride; fiancée
5LatinsponsusA groom; A fiancé; A bail, surety
6LatinspondeoI promise, bind or pledge myself, contract, vow;...
7Proto-Italicspondeōto promise, to pledge
8Proto-Indo-Europeanspondéyeti
9Proto-Indo-Europeanspend-to libate

Words derived from “espousal

Every word from Proto-Indo-European spend-Every word from Proto-Indo-European spondéyetiEvery word from Proto-Italic spondeō