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]