Plain English Meaning
The part of the flight where the airplane is being brought in to land. The approach is the descent and lineup with the runway. The landing is the flare, touchdown on the runway, and slowing down on the ground.
Full Definition
The final segments of a flight in which the airplane descends toward the runway environment, transitions to a stabilized descent path aligned with the runway, and touches down. The approach phase begins when the airplane leaves cruise or pattern altitude to set up for landing and ends at the flare; the landing phase covers the flare, touchdown, and rollout.