an opposing, offsetting, or retaliatory measure.

1920–25; counter- + measure Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
countermeasure (ˈkaʊntəˌmɛʒə)
action taken to oppose, neutralize, or retaliate against some other action

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1923, from counter- + measure (n.).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
But a different type of countermeasure could be even more effective.
And oil rich sheiks buying a bomb or two for emergencies and insurance and
The fact is that the stage is setting precisely to create a countermeasure
  against losing a national election.
The company is also testing a second inhibitor as a countermeasure to
  space-flight-induced muscle changes.
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