Pronunciation: (pru-pôr'shu-nl, -pōr'-), [key]
1. having due proportion; corresponding.
2. being in or characterized by proportion.
3. of, pertaining to, or based on proportion; relative.
4. Math.
a. (of two quantities) having the same or a constant ratio or relation: The quantities y and x are proportional if y/x = k, where k is the constant of proportionality.
b. (of a first quantity with respect to a second quantity) a constant multiple of: The quantity y is proportional to x if y = kx, where k is the constant of proportionality.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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