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civil defense emergency procedures and facilities organized by civilians for the protection of people and property in cases of flood, famine, war, or the like.
defense mechanism in psychology, an unconscious process that submerges or opposes ideas or actions that would be painful or inappropriate. [2 definitions]
Department of Defense the U.S. federal department of the executive branch of government responsible for national security, military policy, and military forces. The Department of Defense includes the Army, Navy, and Air Force.
self-defense the act or an instance of protecting oneself against physical attack. [3 definitions]
Strategic Defense Initiative a proposed U.S. defense system in which enemy missiles would be detected and destroyed in flight by weaponry contained in earth satellites, also known as Star Wars in reference to similar technology found in the science fiction saga of that name.