| 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
|