A line resembling a ruler, used to measure distance on a map. The line is divided into units at a ratio proportional to the scale of the map and labelled numerically to indicate the distance of each mark from the zero mark on the line. (Also called a graphic and linear scale).
a line on a map used to measure distances.
a graphical representation of a ground distance plotted to scale, with the advantage that the map scale remains true when the map itself is enlarged or reduced in photocopying