[ ree-in-fawrs, -fohrs ]
/ ˌri ɪnˈfɔrs, -ˈfoʊrs /

verb (used with object), re·in·forced, re·in·forc·ing.


something that reinforces.
a metal band on the rear part of the bore of a gun, where the explosion occurs.


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Also reenforce, re-enforce.

Origin of reinforce

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


re·in·forc·er, nounself-re·in·forc·ing, adjectiveun·re·in·forced, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Example sentences from the Web for reinforce

British Dictionary definitions for reinforce

/ (ˌriːɪnˈfɔːs) /

verb (tr)

to give added strength or support to
to give added emphasis to; stress, support, or increasehis rudeness reinforced my determination
to give added support to (a military force) by providing more men, supplies, etc
psychol to reward an action or response of (a human or animal) so that it becomes more likely to occur again

Derived forms of reinforce

reinforcement, noun

Word Origin for reinforce

C17: from obsolete renforce, from French renforcer; see re- + inforce enforce
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Medical definitions for reinforce

[ rē′ĭn-fôrs ]


To give more force or effectiveness to something; strengthen.
To reward an individual, especially an experimental subject, with a reinforcer subsequent to a desired response or performance.
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.