Plain English Meaning

Using the control wheel and the rudder pedals together, in the right amounts, so the airplane turns smoothly without sliding sideways through the air.

Full Definition

The simultaneous, matched application of aileron and rudder control inputs in the same direction and in the right proportion to produce a turn without slipping or skidding. The ailerons bank the airplane to establish the turn, while rudder pressure offsets adverse yaw and keeps the longitudinal axis aligned with the flight path.