- Secretary of Defense, Defense Secretary - the person who holds the secretaryship of the Defense Department; "the first Defense Secretary was James V. Forrestal who was appointed by Truman"
--1 is a kind of secretary
- Secretary of Defense, Defense Secretary - the position of the head of the Department of Defense; "the position of Defense Secretary was created in 1947"
--2 is a kind of secretaryship
--2 is a member of United States Cabinet, US Cabinet