the act of reinforcing.

the state of being reinforced.

something that reinforces or strengthens.

Often, reinforcements. an additional supply of personnel, ships, aircraft, etc., for a military force.

a system of steel bars, strands, wires, or mesh for absorbing the tensile and shearing stresses in concrete work.

Psychology .

a procedure, as a reward or punishment, that alters a response to a stimulus.

the act of reinforcing a response.