American Dictionary of the English Language

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DIMENSION, noun [Latin , to measure; Gr. See Mete and Measure.] In geometry, the extent of a body, or length, breadth and thickness or depth. A line has one dimension or length; a superficies has two dimensions, length and breadth; and a solid has three dimensions, length, breadth and thickness or depth. The word is generally used int eh plural, and denotes the whole space occupied by a body, or its capacity, size, measure; as the dimensions of a room, or of a ship; the dimensions of a farm, of a kingdom, etc.