CO-RESPONDENT, in law, generally, a person made respondent to, or called upon to answer, along with another or others, a petition or other proceeding. More particularly, since the Matrimonial Causes Act 1857, the term is applied to the person charged by a husband, when presenting a petition praying for the dissolution of his marriage on the ground of adultery, with misconduct with his wife, and made, jointly with her, a respondent to the suit. (See also Divorce.)