1. (n.) 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.

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

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

4. (n.) 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. (n.) The manifoldness with which the fundamental units of time, length, and mass are involved in determining the units of other physical quantities.

acreage ambit amplitude area bigness body breadth bulk caliber circle compass confines continuum coverage depth diameter dimensions emptiness empty space expanse expansion extension extent field galactic space gauge girth greatness height infinite space interstellar space largeness length magnitude mass measure measurement nothingness outer space proportion proportions radius range reach scale scope size space spatial extension sphere spread superficial extension surface tract void volume width