Definitions

1. noun

Mean Sea Level; a standard level of 0 meters (0 feet) above the average sea level, used as a reference point for measuring elevations and sea levels.

“The elevation of the new building was measured in relation to the MSL to ensure it complies with local building codes.”

2. initialism

Magnetic Susceptibility Level; a unit of measurement for magnetic susceptibility.

“The instrument measured the MSL of the rock sample to determine its magnetic properties.”