Search Result for "transsexualism": 
Wordnet 3.0

NOUN (1)

1. condition in which a person assumes the identity and permanently acts the part of the gender opposite to his or her biological sex; 



WordNet (r) 3.0 (2006):

transsexualism
    n 1: condition in which a person assumes the identity and
         permanently acts the part of the gender opposite to his or
         her biological sex