Entry 2 senses · 2 variants Webster, 1913 Heterosexual · IPA /ˌhɛtəɹəˈsɛkʃuəl/ a. n. 01 a. Sexually attracted primarily to other members of the opposite sex; -- as opposed to homosexual. 1. Sexually attracted primarily to other members of the opposite sex; -- as opposed to homosexual. 02 n. A heterosexual person or organism. 1. A heterosexual person or organism.