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gender binary

[jen-der bahy-nuh-ree, ‐ner-ee]
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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.
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Origin of gender binary

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