n. & v.
n. 1 a measurable extent of any kind, as length, breadth, depth, area, and volume. 2 (in pl.) size, scope, extent. 3 an aspect or facet of a situation, problem, etc. 4 Algebra one of a number of unknown or variable quantities contained as factors in a product (x(3), x(2)y, xyz, are all of three dimensions). 5 Physics the product of mass, length, time, etc., raised to the appropriate power, in a derived physical quantity.
v.tr. (usu. as dimensioned adj.) mark the dimensions on (a diagram etc.). dimensional adj. (also in comb.). dimensionless adj.
[ ME f. OF f. L dimensio -onis (as DI-(2), metiri mensus measure) ]