1. Measurable extent or quantity (such as amplitude, brightness, hue, frequency, length, width, height, time, mass, volume, weight) that denotes the degree to, or range over, which something extends. In scientific terms, a space has as many dimensions as there are mutually perpendicular axes at each point within it. Therefore a line has one dimension (length), a plane has two dimensions (length and width), and the space surrounding us has three dimensions (length, width, and height) to which Einstein's Theory of Relativity adds another dimension, time.
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