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reinforce (v.)

also re-enforce, "add new force, strength, or weight to," c. 1600, originally in military sense, from re- "again" + inforce, variant of enforce "drive by physical force; fortify, strengthen" (compare re-enforce, and see en- (1)). Related: Reinforced; reinforcing.

The ordinary form (rein-) has been so far divorced from the simple verb (formerly inforce or enforce, now always the latter) that it seldom or never means to enforce again, as when a lapsed regulation  is revived. For that sense re-enforce should be used. [Fowler]

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Definitions of reinforce from WordNet

reinforce (v.)
make stronger;
he reinforced the concrete
Synonyms: reenforce
reinforce (v.)
strengthen and support with rewards;
Let's reinforce good behavior
Synonyms: reward
From wordnet.princeton.edu