noun re·in·force·ment \ˌrē-ən-ˈfrs-mənt\

reinforcements : people and supplies that are sent to help or support an army, military force, etc.

: the act of strengthening or encouraging something

: a thing that strengthens or encourages something

Full Definition of REINFORCEMENT

:  the action of reinforcing :  the state of being reinforced
:  something that reinforces


  1. We're outnumbered! Call for reinforcements!
  2. We need to prevent enemy reinforcements from reaching the front line.
  3. The bridge is in need of reinforcement.
  4. You should encourage good behavior with positive reinforcement.

First Known Use of REINFORCEMENT



noun re·in·force·ment \ˌrē-ən-ˈfōr-smənt, -ˈfr-\   (Medical Dictionary)

Medical Definition of REINFORCEMENT

:  the action of causing a subject (as a student or an experimental animal) 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 (as the sight of food) paired with a conditioned stimulus (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—compare recruitment 1


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