(a) strange, unusual
A member of the lgbt community.
Originally, "queer" was simply just another word for strange, unusual, or wierd. When gay people first started coming out of the closet, they were seen as strange, unusual, and diseased. Thus, the word "queer" began denoting someone who is gay, lesbian, transgendered, or bisexual. Recently, it has been adopted by many people in the LGBT
commnunity as an acceptable umbrella term. However, not all people are comfortable using it.