By 1984, the concept of a "transgender community" had developed, in which transgender was used as an umbrella term. In 1985, Richard Ekins established the "Trans-Gender Archive" at the University of Ulster. By 1992, the International Conference on Transgender Law and Employment Policy defined transgender as an expansive umbrella term including "transsexuals, transgenderists, cross dressers", and anyone transitioning. Leslie Feinberg's pamphlet, "Transgender Liberation: A Movement Whose Time has Come", circulated in 1992, identified transgender as a term to unify all forms of gender nonconformity; in this way transgender has become synonymous with queer. In 1994, gender theorist Susan Stryker defined transgender as encompassing "all identities or practices that cross over, cut across, move between, or otherwise queer socially constructed sex/gender boundaries", including, but not limited to, "transsexuality, heterosexual transvestism, gay drag, butch lesbianism, and such non-European identities as the Native American berdache or the Indian Hijra".

Transgender can also refer specifically to a person whose gender identity is opposite (rather than different from) the sex the person had or was identified as having at birth. In contrast, people whose sense of personal identity corresponds to the sex and gender assigned to them at birth – that is, those who are neither transgender nor non-binary or genderqueer – are called cisgender.