Altimeter setting

The barometric pressure at a given location corrected to mean (average) sea level.

Aviation Maintenance Technician Handbook — Airframe, p. G-2

Also defined in 1 more source

Station pressure (the barometric pressure at the location the reading is taken) which has been corrected for the height of the station above sea level.

Pilot's Handbook of Aeronautical Knowledge, p. G-3

Taught in GEN-J Procedures, GEN-J Quick reference.