Definition 1: a doctrine in tort and contract law: a person injured by another is required to mitigate his or her losses resulting from the injury <whether the patient shares any fault and whether the patient has satisfied the requirements of mitigation of damages D'Aries v. Schell, 644 A.2d 134 (1994)> also : an affirmative defense based on this doctrine 2: a reduction in the amount of damages awarded a party