Wiktionary
n. A system of behavior modification based on the principles of operant conditioning; patients are rewarded with tokens (reinforcers) for engaging in desirable activities.
WordNet
n. a form of behavior therapy that has been used in some mental institutions; patients are rewarded with tokens for appropriate behavior and the tokens may be cashed in for valued rewards
Wikipedia
A token economy is a system of contingency management based on the systematic reinforcement of target behavior. The reinforcers are symbols or "tokens" that can be exchanged for other reinforcers. A token economy is based on the principles of operant conditioning and behavioral economics and can be situated within applied behavior analysis. In applied settings token economies are used with children and adults; however, they have been successfully modeled with pigeons in lab settings.