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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 retail store organized into departments, each of which orders, displays, and sells certain types of merchandise.
fire department a department of a city or town government that works to prevent and put out fires, or the persons employed in it.
police department a governmental agency whose purpose is to enforce the law and protect citizens and property from harm.