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Comprehensive
Dictionary Suite
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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.
executive branch one of the three branches of the government in the United States. The job of the executive branch is to carry out the laws of a country. The president and various departments make up the executive branch.
Oval Office the seat or symbol of authority and power in the executive branch of the U.S. Government. [1/2 definitions]
White House the executive branch of the U.S. federal government (prec. by "the"). [1/2 definitions]