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1. a person who permanently acts the part of and completely identifies with the opposite sex
2. a person who has undergone medical and surgical procedures to alter external sexual characteristics to those of the opposite sex
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005
transsexuala person who experiences a profound and constant dislocation between his or her physiological sex and his or her ascribed GENDER. Sometimes there is a desire to change physiological sex so that this comes into line with subjective feelings of gender identity The term ‘transsexual’ was introduced in 1953.
Collins Dictionary of Sociology, 3rd ed. © HarperCollins Publishers 2000
An individual whose chromosomes, gonads, and body habitus mark that individual as a member of one sex, but who feels psychically to be of the other sex, with an overwhelming desire for sex reassignment through surgical and hormonal intervention.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.