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Definition of sister
1a woman or girl in relation to other daughters and sons of her parents. a close female friend or associate, especially a female fellow member of a labor union or other organization. (often Sister) a member of a religious order or congregation of women. a fellow woman seen in relation to feminist issues. informal a black woman (chiefly used as a term of address by other black people). [usually as modifier] a thing, especially an organization, that bears a relationship to another of common origin or allegiance or mutual association:Eastern’s sister airline, Continental a sister ship 2 (often Sister) British a senior female nurse, typically in charge of a ward.