Lum·ber n.
 1. A pawnbroker's shop, or room for storing articles put in pawn; hence, a pledge, or pawn. [Obs.]
    They put all the little plate they had in the lumber, which is pawning it, till the ships came.   --Lady Murray.
 2. Old or refuse household stuff; things cumbrous, or bulky and useless, or of small value.
 3. Timber sawed or split into the form of beams, joists, boards, planks, staves, hoops, etc.; esp., that which is smaller than heavy timber. [U.S.]
 Lumber kiln, a room in which timber or lumber is dried by artificial heat. [U.S.]
 Lumber room, a room in which unused furniture or other lumber is kept. [U.S.]
 Lumber wagon, a heavy rough wagon, without springs, used for general farmwork, etc.
 dimensional lumber, lumber, usually of pine, which is sold as beams or planks having a specified nominal cross-section, usually in inches, such a two-by-four, two-by-six, four-by-four, etc.


 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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