—v.t. 1. to strengthen with some added piece, support, or material: to reinforce a wall. 2. to strengthen (a military force) with additional personnel, ships, or aircraft: to reinforce a garrison. 3. to strengthen; make more forcible or effective: to reinforce efforts. 4. to augment; increase: to reinforce a supply. 5. Psychol.to strengthen the probability of (a response to a given stimulus) by giving or withholding a reward.
—n. 1. something that reinforces.
2. a metal band on the rear part of the bore of a gun, where the explosion occurs. Also,reenforce,re-enforce.