reinforcer
rein·for·cer
noun
1.
(psychology) a stimulus that strengthens or weakens the behavior that produced it
Origin
From reinforce + -er.
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WordNet 2.1 (Princeton University). Wiktionary (CC BY-SA). WordNet 2.1 Copyright Princeton University. All rights reserved. Wiktionary content is available under the Creative Commons Attribution-ShareAlike Licence.