[ree-in-fawrs, -fohrs]
verb (used with object), reinforced, reinforcing.
to strengthen with some added piece, support, or material: to reinforce a wall.
to strengthen (a military force) with additional personnel, ships, or aircraft: to reinforce a garrison.
to strengthen; make more forcible or effective: to reinforce efforts.
to augment; increase: to reinforce a supply.
Psychology. to strengthen the probability of (a response to a given stimulus) by giving or withholding a reward.
something that reinforces.
a metal band on the rear part of the bore of a gun, where the explosion occurs.
Also, reenforce, re-enforce.

1590–1600; re- + inforce, alteration of enforce

reinforcer, noun
self-reinforcing, adjective
unreinforced, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
reinforce (ˌriːɪnˈfɔːs)
1.  to give added strength or support to
2.  to give added emphasis to; stress, support, or increase: his rudeness reinforced my determination
3.  to give added support to (a military force) by providing more men, supplies, etc
4.  psychol to reward an action or response of (a human or animal) so that it becomes more likely to occur again
[C17: from obsolete renforce, from French renforcer; see re- + inforceenforce]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1600, originally in military sense, from re- "again" + enforce (cf. re-enforce).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

reinforce re·in·force (rē'ĭn-fôrs')
v. re·in·forced, re·in·forc·ing, re·in·forc·es

  1. To give more force or effectiveness to something; strengthen.

  2. To reward an individual, especially an experimental subject, with a reinforcer subsequent to a desired response or performance.

  3. To stimulate a response by means of a reinforcer.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
Your article reinforces our conclusion that the flood prevention benefits of
  such a measure would be dramatic.
The short lifetime of many alluvial deposits often reinforces this dynamic.
The mobile team sees the hardest cases and reinforces the authority of the
  village health worker.
It reinforces our conviction that strategic investments can make a huge
  difference in poor people's lives.
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