the.com/fiancee

means A woman who is engaged to be married — the future spouse-in-waiting, after the proposal but before the wedding.

from Straight from French, where fiancée is the feminine form of fiancé, both rooted in the verb fiancer, 'to betroth.' That traces back through Old French fiance, 'a promise or trust,' which leans on the Latin fidere, 'to trust' — the same faith-and-fidelity family that gives us 'confide' and 'fidelity.' So buried in the word is the old idea that an engagement is, at its heart, a pledge of trust. English borrowed it in the 19th century, accent marks and all, though we tend to drop them in a hurry.