Fiance
来自Big Physics
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mid 19th century: from French, past participle of fiancer ‘betroth’, from Old French fiance ‘a promise’, based on Latin fidere ‘to trust’.
wiktionary
From French fiancé. The verb is from fiancer.
etymonline
fiance (n.)
"man to whom one is betrothed," 1864 (by 1826 as a French word in English), from French fiancé, past participle of fiancer "to betroth" (see fiancee). Borrowed earlier in Middle English as "confidence, trust; word of honor."
