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Wiktionary
sexual minority

n. (context idiomatic English) LGBT people; those outside of the mainstream of accepted sexual expression or sexual orientation in a given culture

Wikipedia
Sexual minority

A sexual minority is a group whose sexual identity, orientation or practices differ from the majority of the surrounding society. It can also refer to transgender, genderqueer (including third gender) or intersex individuals. The term is primarily used to refer to LGB individuals, particularly gay people.

More recently, the catch-all terms GSM ("Gender and Sexual Minorities"), GSRM ("Gender, Sexual, and Romantic Minorities"), GSD ("Gender and Sexual Diversity"), and GSRD ("Gender, Sexual and Romantic Diversity") have been proposed.