gender

(noun) a grammatical category in inflected languages governing the agreement between nouns and pronouns and adjectives; in some languages it is quite arbitrary but in Indo-European languages it is usually based on sex or animateness. Synonyms: grammatical gender.

(noun) the properties that distinguish organisms on the basis of their reproductive roles. Synonyms: sex, sexuality. Example: "She didn't want to know the sex of the foetus."