Elevation
Elevation explained in an easy to understand way:
Imagine trying to measure how high you are in a crowded elevator when all you see are floors passing by. This is similar to figuring out the elevation of a mountain, which involves knowing how high it is above a fixed point, like sea level, rather than just how many steps you've climbed. Just as you need to know where the ground floor is to determine your floor in a building, you need to know sea level to accurately measure an object's elevation.
Practice Version
Elevation: The height of an object above sea level. Elevation. Elevation is the height or altitude of a place or object measured from sea level.