Source : WordNet®

Secretary of Defense
     n 1: the person who holds the secretaryship of the Defense
          Department; "the first Defense Secretary was James V.
          Forrestal who was appointed by Truman" [syn: {Defense
          Secretary}]
     2: the position of the head of the Department of Defense; "the
        position of Defense Secretary was created in 1947" [syn: {Defense
        Secretary}]