Definition of countermeasure noun from the Oxford Advanced Learner's Dictionary

 

countermeasure

 noun
noun
BrE BrE//ˈkaʊntəmeʒə(r)//
 
; NAmE NAmE//ˈkaʊntərmeʒər//
 
 
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a course of action taken to protect against something that is considered bad or dangerous countermeasures to neutralize the threat of terrorism
See the Oxford Advanced American Dictionary entry: countermeasure