reinforcement

Etymology

From reinforce + -ment.

noun

1. (uncountable) The act, process, or state of reinforcing or being reinforced.
2. (countable) A thing that reinforces.
   There's a website that can be a good learning reinforcement.
3. (in the plural) Additional troops or materiel sent to support a military action.
   Send in the reinforcements!
4. (uncountable, behavioral psychology) The process whereby a behavior with desirable consequences comes to be repeated.
5. A small round white sticker placed around a punched hole in a piece of paper to prevent the binder's rings from tearing through the paper.