Plain English Meaning
Move the nose up or down to control how fast you are going, and add or reduce engine power to control whether you climb, descend, or stay level.
Full Definition
A control technique in which the pilot uses elevator (pitch) to set and hold a target airspeed, and uses throttle (power) to set and hold a target altitude or vertical path. It is one of two complementary methods of managing the airplane's energy state, typically applied during slow flight, approach, and landing where precise airspeed control is .