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reinforcement (n.)

c. 1600, "act of reinforcing," from reinforce + -ment. Meaning "an augmentation, an additional force, that which reinforces" is from 1650s. In psychology by 1876. Related: Reinforcements.

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Definitions of reinforcement from WordNet

reinforcement (n.)
a military operation (often involving new supplies of men and materiel) to strengthen a military force or aid in the performance of its mission;
Synonyms: support / reenforcement
reinforcement (n.)
information that makes more forcible or convincing;
his gestures provided eloquent reinforcement for his complaints
Synonyms: reenforcement
reinforcement (n.)
(psychology) a stimulus that strengthens or weakens the behavior that produced it;
Synonyms: reinforcing stimulus / reinforcer
reinforcement (n.)
a device designed to provide additional strength;
he used gummed reinforcements to hold the page in his notebook
Synonyms: strengthener
reinforcement (n.)
an act performed to strengthen approved behavior;
Synonyms: reward
From wordnet.princeton.edu