1
general::
noun ADJ. current, latest, new | ex-, former, old | long-standing, long-term, serious, steady | live-in | pregnant | jealous | jilted QUANT. string, succession VERB + GIRLFRIEND have | meet | live with | sleep with | propose to | marry
Oxford Collocations Dictionary
2
general::
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.
Longman-Thesaurus