gender binary

[jen-der bahy-nuh-ree, ‐ner-ee]
noun
  1. a classification system consisting of two genders, male and female.
  2. a concept or belief that there are only two genders and that one's biological or birth gender will align with traditional social constructs of masculine and feminine identity, expression, and sexuality.

Origin of gender binary

First recorded in 1980–90
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018