Aviation Dictionary
وضعیت میل لنگ بر حسب درجه قبل از آنکه پیستون به نقطه مرگ بالای خود در سیلندر برسد
The position of the piston in the cylinder of a reciprocating engine as the piston is moving upward, just before the top of its stroke, with the crankshaft turning in the direction of normal rotation.