The Open Dictionary

other woman

noun

UK/ˌʌð.ə ˈwʊm.ən/
US/ˌʌð.ɚ ˈwʊm.ən/

Definitions of other woman noun

  1. CountableUsually singular

    A woman who is in a sexual relationship with a person who is married to or in a committed relationship with someone else.

    • She realized she didn't want to be the other woman and ended the relationship.

    • She was always seen as the other woman in the relationship, which caused her great pain.

    • He juggled between his wife and the other woman, which ultimately led to the breakdown of his family.