reinforcement

1. The act, process, or state of reinforcing or being reinforced. (uncountable)
2. A thing that reinforces. (countable) · There's a website that can be a good learning reinforcement.
3. Additional troops or materiel sent to support a military action. (countable, uncountable) · Send in the reinforcements!
4. The process whereby a behavior with desirable consequences comes to be repeated. (uncountable)
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. (countable, uncountable)

Plural reinforcements