- Gender Identity Disorder : Gender Identity Disorder refers to psychological dissatisfaction with biological gender, or a disturbance in the sense of Identity as a male or female. The primary goal is not sexual arousal but rather to live the life of the opposite gender.
Other /More definition:
Gender Identity Disorder refers to a Psychosexual disorder in which a person feels discomfort with and inappropriateness of his or her biological sex, with a marked preference for the clothing and activities of the opposite sex and/or repudiation of the sex organs. It is a condition in which there is a discrepancy between an individual's assigned sex and gender identity, involving a strong and persistent identification with the other gender.