Meaning of “the opposite sex” in the English Dictionary

british dictionary

"the opposite sex" in British English

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the opposite sexnoun [ S, + sing/pl verb ]

uk /ˌɒp.ə.zɪt ˈseks/ us /ˌɑː.pə.zɪt ˈseks/

someone who is male if you are female, and female if you are male:

It's not always easy to meet members of the opposite sex.

(Definition of “the opposite sex” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)