v. t. [ Pref. re- + enforce: cf. F. renforcer. ] 1. To strengthen with new force, assistance, material, or support; as, to reenforce an argument; to reenforce a garment; especially, to strengthen with additional troops, as an army or a fort, or with additional ships, as a fleet. [ Written also reinforce. ] [ 1913 Webster ]

2. (Psychology) To increase the likelihood that (a specific behavior) will be repeated by giving a reward or punishment to a person or animal; as, to reenforce the students' willingness to study by giving awards for good grades. [ PJC ]