-eˌstizəm noun
also trans·ves·ti·tism -estəˌtizəm
( -s )
Etymology: transvestism from German transvestismus, from Latin trans- + vestire to clothe + German -ismus -ism, from Latin; transvestitism from German transvestitismus, from transvestit transvestite + -ismus — more at vest
: the practice of adopting the dress, the manner, and frequently the sexual role of the opposite sex