A fiance is the person you have promised to marry but haven't yet. Meet her fiance, my fiance, introduce your fiance.
It keeps the French gender endings — fiance for a man and fiancee for a woman — which English does for very few words. It is usually written with an accent. Engagement is not a legal state in most countries, though it once was actionable to break one off.
1nounfianceA person you have promised to marry.
“She introduced her fiance to her parents a month before the wedding.”
fiance is an engaged partner.
Also accepted in games: fiancé, fiancee, fiancée
Middle French fiancer means to promise or betroth, from fiance, a promise, from Latin fidere, to trust. Faith and confide come from the same trust.
Middle French
fiancer
Middle English
fyancen
English, today
fiance
From Middle English fyancen, fyauncen, from Middle French fiancer.
Etymology from Wiktionary, CC BY-SA