Someone who cross-dresses, i.e dressing outside of gender. Sometimes done to look like a convincing member of the
opposite sex ("passing"), sometimes not. Sometimes a secret, sometimes not.
Nothing to do with sexuality. Not
necessarily to do with desiring a sex change either.
I can't believe there is no
definition for transvestite on
urban dictionary! Now's my chance...
John: Why is Adam
wearing a dress and a wig? Does he want to be a woman?
Carla: No, he's just a transvestite. He likes to cross dress.