secdef means the United States Defense Secretary, the civilian head of the Department of Defense of the United States of America, a cabinet secretary. Lexicurio rates it Sui generis — a strength score of 88 out of 100.
secdef is pronounced /ˈsɛkˈdɛf/.
noun
- The United States Defense Secretary, the civilian head of the Department of Defense of the United States of America, a cabinet secretary.