| 1. | Also, Commander in Chief. the supreme commander of the armed forces of a nation or, sometimes, of several allied nations: The president is the Commander in Chief of the U.S. Army, Navy, and Air Force. |
| 2. | an officer in command of a particular portion of an armed force who has been given this title by specific authorization. |
| commander in chief n. pl. commanders in chief Abbr. CINC or C in C
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The role of the United States president as highest ranking officer in the armed forces. The Constitution provides this power, but, through the system of checks and balances, gives Congress the authority to declare war. During periods of war, presidents such as Franklin D. Roosevelt, Lyndon Johnson, George H. W. Bush, William Jefferson Clinton, and George W. Bush have taken active roles as commander in chief.