fiance (n.)youdaoicibaDictYouDict[fiance 词源字典]
"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."[fiance etymology, fiance origin, 英语词源]