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From The Collaborative International Dictionary of English v.0.48:
Leveling \Lev"el*ing\, n. [Written also levelling.] 1. The act or operation of making level. [1913 Webster] 2. (Surveying) 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. [1913 Webster] 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. [1913 Webster]