Noun: Secretary of Defense
- The position of the head of the Department of Defense
"the position of Secretary of Defense was created in 1947";
- Defense Secretary
- The person who holds the secretaryship of the Defense Department
"the first Secretary of Defense was James V. Forrestal who was appointed by Truman";
- Defense Secretary
Derived forms: Secretaries of Defense
Type of: secretary, secretaryship
Part of: United States Cabinet, US Cabinet
Encyclopedia: Secretary of Defense