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Di·men·sion n.

1. Measure in a single line, as length, breadth, height, thickness, or circumference; extension; measurement; -- usually, in the plural, measure in length and breadth, or in length, breadth, and thickness; extent; size; as, the dimensions of a room, or of a ship; the dimensions of a farm, of a kingdom.

*Gentlemen of more than ordinary dimensions.* --*W. Irving.*

**Space of dimension**, extension that has length but no breadth or thickness; a straight or curved line.

**Space of two dimensions**, extension which has length and breadth, but no thickness; a plane or curved surface.

**Space of three dimensions**, extension which has length, breadth, and thickness; a solid.

**Space of four dimensions**, as imaginary kind of extension, which is assumed to have length, breadth, thickness, and also a fourth imaginary dimension. Space of five or six, or more dimensions is also sometimes assumed in mathematics.

2. Extent; reach; scope; importance; as, a project of large dimensions.

3. Math. The degree of manifoldness of a quantity; as, time is quantity having one dimension; volume has three dimensions, relative to extension.

4. Alg. A literal factor, as numbered in characterizing a term. The term __dimensions__ forms with the cardinal numbers a phrase equivalent to __degree__ with the ordinal; thus, *a²b²c* is a term of five __dimensions__, or of the fifth degree.

5. pl. Phys. The manifoldness with which the fundamental units of time, length, and mass are involved in determining the units of other physical quantities.

Note: Thus, since the unit of velocity varies directly as the unit of length and inversely as the unit of time, the dimensions of velocity are said to be length ÷ time; the dimensions of work are mass × (length)² ÷ (time)²; the dimensions of density are mass ÷ (length)³.

**Dimensional lumber**, **Dimension lumber**, **Dimension scantling**, *or* **Dimension stock** Carp., lumber for building, etc., cut to the sizes usually in demand, or to special sizes as ordered.

**Dimension stone**, stone delivered from the quarry rough, but brought to such sizes as are requisite for cutting to dimensions given.

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