sex Noun Either of two main divisions (either female or male) into which many organisms can be placed, according to reproductive function or organs.
sex Noun The distinguishing property, quality, or assemblage of properties by which organisms are classified as female or male on the basis of their reproductive organs and functions; the set of properties by which male is distinguished from female.
sex Noun Sexual intercourse; the act of sexual intercourse.
sex Noun Genitalia; a penis or vagina.
sex Noun Women; womankind.
sex Verb To determine the biological sex of an animal.