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proportional

[pruh-pawr-shuh-nl, -pohr-] /prəˈpɔr ʃə nl, -ˈpoʊr-/
adjective
1.
having due proportion; corresponding.
2.
being in or characterized by proportion.
3.
of, relating to, or based on proportion; relative.
4.
Mathematics.
  1. (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.
  2. (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.
Origin of proportional
1350-1400
1350-1400; Middle English proporcional < Latin prōportiōnālis. See proportion, -al1
Related forms
proportionality, noun
proportionally, adverb
interproportional, adjective
nonproportional, adjective
nonproportionally, adverb
subproportional, adjective
subproportionally, adverb
unproportional, adjective
unproportionally, adverb
Can be confused
proportional, proportionate.
Synonyms
1. harmonious, comparative, accordant, consonant, proportionate.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the Web for proportionality
Contemporary Examples
Historical Examples
  • This curve expresses, in terms of value, the idea of proportionality which is an essential part of the quantity theory.

    The Value of Money Benjamin M. Anderson, Jr.
  • But, I repeat, this proportionality is not inherent in the notion of value.

  • Communism rejects independence and proportionality; property does not satisfy equality and law.

    What is Property? P. J. Proudhon
  • It is a proof that where this competition does not exist the proportionality ceases.

  • And now observe how well this conception falls in with the law of proportionality discovered by Newton.

    Six Lectures on Light John Tyndall
British Dictionary definitions for proportionality

proportional

/prəˈpɔːʃənəl/
adjective
1.
of, involving, or being in proportion
2.
(maths) having or related by a constant ratio
noun
3.
(maths) an unknown term in a proportion: in a/b = c/x, x is the fourth proportional
Derived Forms
proportionality, noun
proportionally, adverb
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for proportionality
n.

1560s, from French proportionalité (14c.) or directly from Medieval Latin proportionalitas, from proportio (see proportion).

proportional

adj.

late 14c. (implied in proportionally), from Late Latin proportionalis "pertaining to proportions," from proportio (see proportion). Related: Proportionally.

Online Etymology Dictionary, © 2010 Douglas Harper
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