The relation or adaptation of one portion
to another, or to the whole, as respect magnitude, quantity, or
degree; comparative relation; ratio; as, the proportion of the
parts of a building, or of the body.
Harmonic relation between parts, or between
different things of the same kind; symmetrical arrangement or
adjustment; symmetry; as, to be out of proportion.
The portion one receives when a whole is
distributed by a rule or principle; equal or proper share;
lot.
A part considered comparatively; a
share.
The
equality or similarity of ratios, especially of geometrical ratios; or
a relation among quantities such that the quotient of the first
divided by the second is equal to that of the third divided by the
fourth; -- called also geometrical proportion, in distinction
from arithmetical proportion, or that in which the difference
of the first and second is equal to the difference of the third and
fourth.
In celebration of Noah Webster's Birthday (October 16, 2009), we have prepared an updated website. 
