Plain English Meaning
The climb path the airplane should actually achieve after losing an engine on takeoff, based directly on the performance numbers in the flight manual, with nothing subtracted for safety.
Full Definition
The unadjusted climb path an airplane is expected to fly after takeoff with one engine inoperative, calculated using the manufacturer's certified performance data without any safety margin reduction. It represents the demonstrated performance of the aircraft, not the performance assumed for obstacle clearance planning.
Context Anchor
Seen in instrument departure and takeoff obstacle-clearance planning, especially when checking whether an aircraft can safely continue a takeoff after losing one engine.