electronic countermeasure


electronic countermeasure

[i‚lek′trän·ik ′kau̇nt·ər‚mezh·ər] (electronics) An offensive or defensive tactic or device using electronic and reflecting apparatus to reduce the military effectiveness of enemy equipment involving electromagnetic radiation, such as radar, communication, guidance, or other radio-wave devices. Abbreviated ECM. Also known as electromagnetic countermeasure.