Plain English Meaning
An approach where everything is set up correctly and stays that way: right path, right speed, right configuration, gentle descent, and only small adjustments needed all the way to the runway.
Full Definition
An approach to landing flown with the aircraft on the correct flight path, at the correct airspeed, in the proper landing configuration, with a controlled and predictable rate of descent and engine power setting, and only minor corrections required to maintain those conditions to the runway threshold.
Context Anchor
Used during landing training, approach , and instructor decisions about whether a student should a landing or away and try again.