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

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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.
Department of Homeland Security an executive department of the U.S. federal government whose mission is to protect U.S. citizens and property from terrorist assault.
department store a large store with separate departments, each selling a certain type of goods.
fire department a part of a city or town government that works to prevent and put out fires, or the people who work for it.