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Merriam-Webster:
2c: a response to someone's behavior that is intended to make that person more likely to behave that way again
// positive/negative reinforcement
3: psychology : the action of causing a subject to learn to give or to increase the frequency of a desired response that in classical conditioning involves the repeated presentation of an unconditioned stimulus (such as the sight of food) paired with a conditioned stimulus (such as the sound of a bell) and that in operant conditioning involves the use of a reward following a correct response or a punishment following an incorrect response
also : the reward, punishment, or unconditioned stimulus used in reinforcement

Wiktionary:
reinforce, verb
3. (transitive) to encourage (a behavior or idea) through repeated stimulus.
Advertising for fast food can reinforce unhealthy dietary tendencies.