a man engaged to be married. Synonyms: future groom, future husband, future spouse, betrothed.
Also, fi·an·ce.
Origin: 1850–55; < French: betrothed, past participle of fiancer,Old French fiancier, verbal derivative of fiance a promise, equivalent to fi(er) to trust (< Vulgar Latin *fīdāre,Latin fīdere) + -ance-ance; see -ee