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Use "fiancee" in a sentence
"When I walked into the meeting I was greeted by her fiancee -- well actually I think the term fiancee refers to an engaged woman but this was the man Samantha is engaged to be married to -- and two Herd volunteers dressed in Herd T-Shirts."
"On the +1 thing: My boyfriend proposed last week, and has now taken to telling our friends (who know how much of nerds we are) that a fiancee is a +1 girlfriend."
"First, I assume you are using conventional French gender-forms and your fiancee is a woman."