| 1. | the U.S. department consisting of practically all military aviation forces, established July 26, 1947. |
| 2. | (lowercase ) a similar department in any military organization. |
| 3. | (lowercase ) (formerly) the largest unit in the U.S. Army Air Forces. |
| 4. | (lowercase ) a unit of U.S. Air Force command between an air division and an air command. |
| 5. | (sometimes lowercase ) the military unit of a nation charged with carrying out military operations in the air. |
| 6. | British. Royal Air Force. |

| air force n.
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