1. Grammar a. A grammatical category, often designated as male, female, or neuter, used in the classification of nouns, pronouns, adjectives, and, in some languages, verbs that may be arbitrary or based on characteristics such as sex or animacy and that determines agreement with or selection of modifiers, referents, or grammatical forms.
b. The fact of being classified as belonging to such a category: agreement in gender, number, and case.
2. a. Either of the two divisions, designated female and male, by which most organisms are classified on the basis of their reproductive organs and functions; sex.
b. One's identity as female or male or as neither entirely female nor entirely male.
c. Females or males considered as a group: Students lined up with the genders in different lines.