GNU Collaborative International Dictionary of English

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Found one definition

1.       
   Leveling, n. [Written also levelling.]
   The act or operation of making level.
   1913 Webster
   (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