Plain English Meaning
Everything you do with the airplane while it's on the ground at the airport, before you fly and after you land.
Full Definition
All activities involving an aircraft on the surface of an airport, including preflight inspection, engine start, taxiing, run-up, parking, shutdown, and post-flight procedures. Ground operations cover everything a pilot does with the airplane before takeoff and after landing, while it remains on the ground.
Context Anchor
Seen early in flight training when learning preflight actions, engine start, movement on the airport surface, and shutdown after flight.