Consensual \Con*sen"su*al\, a. [See {Consent}, v. i., and cf. {Sensual}.] 1. (Law) Existing, or made, by the mutual consent of two or more parties. 2. (Physiol.) Excited or caused by sensation, sympathy, or reflex action, and not by conscious volition; as, consensual motions. {Consensual contract} (Law), a contract formed merely by consent, as a marriage contract.