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The height of a level, point, or object measured in feet Above Ground Level (AGL) or from Mean Sea Level (MSL). (See FLIGHT LEVEL.)
MSL Altitude- Altitude expressed in feet measured from mean sea level.
AGL Altitude- Altitude expressed in feet measured above ground level.
Indicated Altitude- The altitude as shown by an altimeter. On a pressure or barometric altimeter it is altitude as shown uncorrected for instrument error and uncompensated for variation from standard atmospheric conditions. (See ALTITUDE.)
The vertical distance of a level, a point or an object considered as a point, measured from mean sea level (MSL).
source: FAA Pilot/Controller Glossary
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