a gender classification in societies that recognize a gender other than male or female.
a person who identifies as a gender other than male or female or as neither male nor female.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for third gender
Four countries have third-gender options on their passport forms.Caster Semenya And The IOC’s Olympics Gender Bender|Jesse Ellison|July 26, 2012|DAILY BEAST