noun
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(countable) A category into which sexually-reproducing organisms are divided on the basis of their reproductive roles in their species; the system of such categories, which can differ by organism or by taxonomic branch.
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(countable) Another category, especially of humans and especially based on sexuality or gender roles.
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(countable) The members of such a category, taken collectively.
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(uncountable) The distinction and relation between these categories, especially in humans; gender.
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(obsolete or literary, uncountable, with "the") Women; the human female gender and those who belong to it.
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(uncountable) Sexual activity, usually sexual intercourse unless preceded by a modifier.
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(countable, euphemistic or slang) Genitalia: a penis or vagina/vulva.