reinforcement

noun5

1. •
   The act, process, or state of reinforcing or being reinforced.
2. •
   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. •
   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.
5. •
   The process whereby a behavior with desirable consequences comes to be repeated.