air force

Short definition from Wiktionary

Noun

1. 1
   A branch of the military mainly devoted to air warfare, as opposed to (land) army and (sea) navy.
2. 2
   A unit in the U.S. Air Force larger than a division but smaller than a command.

Proper noun

1. 1
   The military air force of a particular armed forces.
2. 2
   Ellipsis of United States Air Force.
3. 3
   Ellipsis of Air Force Falcons sports teams representing the United States Air Force Academy.