[ pruh-pawr-shuh-nl ]
See synonyms for proportional on
  1. having due proportion; corresponding.

  2. being in or characterized by proportion.

  1. of, relating to, or based on proportion; relative.

  2. Mathematics.

    • (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.

    • (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

First recorded in 1350–1400; Middle English proporcional, from Latin prōportiōnālis; see proportion, -al1

Other words for proportional

Other words from proportional

  • pro·por·tion·al·i·ty [pruh-pawr-shuh-nal-i-tee], /prəˌpɔr ʃəˈnæl ɪ ti/, noun
  • pro·por·tion·al·ly, adverb
  • in·ter·pro·por·tion·al, adjective
  • non·pro·por·tion·al, adjective
  • non·pro·por·tion·al·ly, adverb
  • sub·pro·por·tion·al, adjective
  • sub·pro·por·tion·al·ly, adverb
  • un·pro·por·tion·al, adjective
  • un·pro·por·tion·al·ly, adverb

Words that may be confused with proportional

Words Nearby proportional Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use proportional in a sentence

British Dictionary definitions for proportional


/ (prəˈpɔːʃənəl) /

  1. of, involving, or being in proportion

  2. maths having or related by a constant ratio

  1. maths an unknown term in a proportion: in a/b = c/x, x is the fourth proportional

Derived forms of proportional

  • 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