Definition 1 of 2
Plain English Meaning
The engine setting used for taking off. It is the strongest power the manufacturer allows for that part of the flight, and the pilot sets it by moving the throttle to the position the handbook specifies.
Full Definition
The maximum power setting approved by the engine or aircraft manufacturer for use during the takeoff roll and initial climb, applied by advancing the throttle to the position specified in the Pilot's Operating Handbook (POH) or Aircraft Flight Manual (AFM). For most piston-engine trainers this means full throttle; for turbocharged, turboprop, and it is a , , or , often to a set time .