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Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
ecm is a noun meaning "electronic warfare undertaken to prevent or reduce an enemy's effective use of the electromagnetic spectrum". It carries one recorded sense.
electronic warfare undertaken to prevent or reduce an enemy's effective use of the electromagnetic spectrum
Forms marked · are formed by the regular rule rather than recorded in the source data. English keeps a few hundred irregulars and the rest follow the pattern, so the rule is right far more often than not — but it is a rule, and the mark says so.
Definitions, synonyms and semantic relations for ecm come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.