Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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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]
self-defense the act or an instance of protecting oneself against physical attack. [3 definitions]