To reinforce is defined as to increase the number or amount, or to make stronger.(verb)
An example of to reinforce is adding additional facts to prove an argument.
See reinforce in Webster's New World College Dictionary
Origin: re- + inforce, var. of enforce
See reinforce in American Heritage Dictionary 4
also re-en·force or re·en·forcetransitive verb re·in·forced also re-en·forced or re·en·forced, re·in·forc·ing also re-en·forc·ing or re·en·forc·ing, re·in·forc·es also re-en·forc·es or re·en·forc·es
Origin: + inforce (variant of enforce).
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