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.
Extent; reach; scope; importance; as, a
project of large dimensions.
The degree of manifoldness
of a quantity; as, time is quantity having one dimension;
volume has three dimensions, relative to extension.
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.
The manifoldness
with which the fundamental units of time, length, and mass are
involved in determining the units of other physical quantities.
In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 
