A countermeasure is a system (usually for a military application) designed to prevent sensor-based weapons from acquiring and/or destroying a target. Countermeasures that alter the electromagnetic, acoustic or other signature(s) of a target thereby altering the tracking and sensing behavior of an incoming threat are designated softkill measures. Measures that physically counterattack an incoming threat thereby destroying/altering its payload/warhead in such a way that the intended effect on the target is majorly impeded are designated hardkill measures.
OmegaWiki Dictionary
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countermeasure An action taken to offset another action.
