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1. commander-in-chief
The Constitutional military rank of the President of the United States.
The highest rank in the United States military.
Franklin Roosevelt and Harry Truman were both commander-in-chiefs during World War II.
2. commander-in-chief
1. n. A self-masturbatory term President Bush uses to reassure himself of his own superiority.

2. n. A term President Bush uses when he is asked a question he does not know the answer to.

Q: "Mr. Bush, do you take advice from your father?"
Bush: "I'm the commander-in-chief!"

Q: "Mr. Bush, why, again, did we invade Iraq?"
Bush: "I'm the commander-in-chief!"