English
gender binary
gender + binary
Proto-Indo-European *ǵenh₁- ‘to produce, beget’
…
Proto-Italic *genos
Latin genus ‘birth, origin; kind, type’
Old French gendre ‘type, kind’
Middle English gendre ‘type’
English gender
Proto-Indo-European *dwóh₁ ‘two’
…
Proto-Italic *dwiznos
Latin bīnus ‘occurring twice, twofold, double, binary’
Late Latin bīnāriu
Middle English binarie
English binary
Today it means
noun A gender system in which people are categorized, in terms of gender and often also sex, exclusively as either male or female.
Language periods are conventional ranges, not dates for this word.
Etymograph / gender binary