- i. When used as a command, it means stop doing whatever you are doing (e.g., abort takeoff).ii. To terminate a preplanned maneuver. To cut short or break off an action, mission, operation, or procedure with an aircraft, especially because of equipment failure or adverse weather conditions. It may occur at any point after the beginning of the mission and prior to its completion.iii. To return or to fly to a friendly base before completing the assigned mission for reasons other than enemy action.iv. To discontinue an aircraft takeoff or a missile launch.
Aviation dictionary. 2014.