| Noun | 1. | EW - military action involving the use of electromagnetic energy to determine or exploit or reduce or prevent hostile use of the electromagnetic spectrum military action, action - a military engagement; "he saw action in Korea" ECM, electronic countermeasures - electronic warfare undertaken to prevent or reduce an enemy's effective use of the electromagnetic spectrum ECCM, electronic counter-countermeasures - electronic warfare undertaken to insure effective friendly use of the electromagnetic spectrum in spite of the enemy's use of electronic warfare electronic warfare-support measures, ESM - electronic warfare undertaken under direct control of an operational commander to locate sources of radiated electromagnetic energy for the purpose of immediate threat recognition electromagnetic intrusion - the deliberate insertion of electromagnetic energy into transmission paths with the objective of confusing or deceiving operators armed forces, armed services, military, military machine, war machine - the military forces of a nation; "their military is the largest in the region"; "the military machine is the same one we faced in 1991 but now it is weaker" |