a line joining points of equal elevation on a surface.
the representation of such a line on a map.
a line parallel to a trace.
Often shortened to:
a line on a map or chart joining points of equal height or depth
Collins English Dictionary - Complete & Unabridged 10th Edition
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A line on a map joining points of equal elevation above a given level, usually mean sea level. ◇ The change in elevation between one contour line and the next is the
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
Your land may be steep or irregular enough that you have more than one key contour line.
Trees along this line are felled on the upstream side of the contour line as much as possible.
Any point on a contour line is the same elevation as all the other points on the same line.
Think of a contour line as an imaginary line on the ground that takes any path necessary to maintain constant elevation.
Point out that a contour line joins points of equal elevation.