1. The act or process of reinforcing or the state of being reinforced. 2. Something that reinforces. 3. Additional personnel or equipment sent to support a military action. 4. The occurrence or experimental introduction of an unconditioned stimulus along with a conditioned stimulus. 5. The strengthening of a conditioned response by such means. 6. An event, a circumstance, or a condition that increases the likelihood that a given response will recur in a situation like that in which the reinforcing condition originally occurred.
