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positive reinforcement (ABA glossary)

The presentation of a stimulus that increases the future likelihood that a behavior will occur.  It is important to note that "positive" does not necessarily mean "good" or "desirable".  Examples of positive reinforcement: 
  1. Giving a child a high five after they clean their room and increases the odds that they will clean their room again next time. 
  2. Giving your spouse a massage after they do the dishes, which leads to them doing the dishes more and more in the future.

Definition reproduced by permission from Amanda N. Kelly at Behaviorbabe.