Level surface

(Physics)

an equipotential surface at right angles at every point to the lines of force.

level surface

[′lev·əl ′sər·fəs] (engineering) A surface which is perpendicular to the plumb line at every point. (geophysics) geopotential surface

A surface which at every point is perpendicular to a plumb line or the direction in which gravity acts; parallel to the surface of still water.

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