1. A member of the transgender community. 2. Someone who assumes the opposite gender identity but does not seek physical sex reassignment. This term evolved in the early 1970's. It was originally intended to fill a gap in the spectrum between the transvestite and the transsexual, meaning someone who perhaps crossdressed more due to gender identity and not for arousal or for the sake of crossdressing itself. The usage of the term has broadened significantly in the last two decades.

a person who exists somewhere between the opposite poles of transsexual and transvestite

a person who lives full-time or nearly full-time in the opposite gender from their birth sex, but does not desire surgery

Same as definition 1 of transgender (see above). Those who mean definition 1 of transgender now tend to use transgenderist to avoid confusion.

One who incorporates aspects, traits, or characteristics of both sexes.