Definitions for ecm
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Princeton's WordNet
electronic countermeasures, ECM(noun)
electronic warfare undertaken to prevent or reduce an enemy's effective use of the electromagnetic spectrum
Wiktionary
ECM(Abbreviation)
Exceptional case-marking.
ECM(Abbreviation)
European Common Market
Citation
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"ecm." Definitions.net. STANDS4 LLC, 2013. Web. 22 May 2013. <http://www.definitions.net/definition/ecm>.