Plain English Meaning
How high the airport sits above sea level, measured at the highest point of its runways.
Full Definition
The officially surveyed highest point of an airport's usable runways, expressed in feet above mean sea level (MSL).
Context Anchor
Seen on airport charts, airport data pages, flight planning tools, and weather reports for an airport.
Derivation
"Field" is an older term for an airport, dating from when airports were literally grass fields. "Elevation" comes from the Latin elevare, meaning "to lift up" — here, how far the ground is lifted above sea level.