Leveling

Lev·el·ing

Leveling

n.
  1. The act or operation of making level.
  2. The art or operation of using a leveling instrument for finding a horizontal line, for ascertaining the differences of level between different points of the earth's surface included in a survey, for establishing grades, etc., as in finding the descent of a river, or locating a line of railroad. (Surveying)

Phrases & Compounds

Leveling instrument
See Surveyor's level, under Level, n.
Leveling staff
a graduated rod or staff used in connection with a leveling instrument for measuring differences of level between points.