Ally (Heterosexual Ally, right Ally) a person who is a friend, advocate, and/or activist for LGBTQ people. an ally that is heterosexual additionally a person who confronts heterosexism in on their own as well as others. The word ally is usually useful for any person in a principal team whom is a friend, advocate or activist for folks in an oppressed team (i.e. White Ally for individuals of Colors).