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Department of Defense

American

noun

the department of the U.S. federal government charged with ensuring that the military capacity of the U.S. is adequate to safeguard the national security. DOD

Department of Defense Cultural

A department of the federal executive branch entrusted with formulating military policies and maintaining American military forces. Its top official is the civilian secretary of defense. It is headquartered in the Pentagon.

Example Sentences

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Department of Defense

Farley also addressed The Wall Street Journal’s recent report that Ford secured a contract with the Department of Defense to build prototype tactical trucks.

From The Wall Street Journal ● Jul. 28, 2026

The BBC has reached out to the Department of Defense for comment.

From BBC ● Jul. 27, 2026

Air Force officials announced in May and December that B-52s would be undergoing testing at Edwards Air Force Base as the Department of Defense looked to upgrade the plane’s engines and radar.

From Los Angeles Times ● Jun. 16, 2026

Department of Defense announced a new multi-billion dollar contract with the computer maker.

From Barron's ● May 28, 2026

The tensions grew when the Department of Defense tightened security after several spy scandals.

From "The Woman All Spies Fear" by Amy Butler Greenfield

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023