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May 27, 2012
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Dictionary


mean' propor'tional



Math.
(between two numbers a and b) a number x for which a/x = x/b: The number 3 is a mean proportional between 1 and 9.

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

mean planetmean solar day
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