girlfriend a girl or woman that you have a romantic relationship with, especially for a fairly long time:
Katherine was his first girlfriend.partner the person you are married to, or the person you are living with and having a sexual relationship with:
He brought his partner along to the party.old flame informal someone who was your girlfriend or boyfriend in the past:
I found a love letter from one of his old flames.mistress a woman that a man has a sexual relationship with even though he is married to someone else. Often used when the man is famous or powerful:
The president had a mistress for many years.lover someone who you have a sexual relationship with, but who you are not married to:
He was going to meet his secret lover.fiancée the woman who a man is going to marry:
Rod plans to marry his fiancée later this year.ex informal a man's former wife or girlfriend:
My ex looks after the children on Thursdays.be going out with somebody if you are going out with a girl or woman, she is your girlfriend:
She's going out with a guy she met at work. [TahlilGaran] English Thesaurus ▲