proportional
Americanadjective
-
having due proportion; corresponding.
- Synonyms:
- proportionate, consonant, accordant, harmonious
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being in or characterized by proportion.
-
of, relating to, or based on proportion; relative.
-
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.
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(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.
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adjective
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of, involving, or being in proportion
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maths having or related by a constant ratio
noun
Other Word Forms
Derived Forms
Etymology
Origin of proportional
First recorded in 1350–1400; Middle English proporcional, from Latin prōportiōnālis; see proportion, -al 1
Explanation
The adjective proportional describes something that has a relative size or amount to something else. When you're a mom, you know it's best to make sure chores are given out proportional amounts according to age and size of your kids. The United States has proportional representation in Congress, meaning that Congressional districts are divided according to the population, set after each census. The adjective proportional can also be used to describe something that has a constant ratio. This usage is especially common in math to describe things like proportional triangles or proportional variables. Proportionate is often interchangeable with proportional.
Vocabulary lists containing proportional
ACT Vocabulary List
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Dear Martin
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Steve Jobs's Commencement Address (2005)
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Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
Before these alleged changes, Kratter’s Spotify streams were “stable and consistent,” meaning that counted streams were proportional to listener activity, the complaint alleges.
From Los Angeles Times • Jun. 9, 2026
A proportional principal-plus-growth approach is another option, though this could also create uneven outcomes if pegged to what the first grandson ultimately receives.
From MarketWatch • May 28, 2026
The researchers concluded that prenatal exposure to CPF appears to cause persistent disturbances in brain development that are proportional to the amount of exposure a child received before birth.
From Science Daily • May 21, 2026
Elections to the Welsh and Scottish Parliaments use a proportional voting system.
From BBC • May 19, 2026
Similarly, in Friedmann’s model the speed at which any two galaxies are moving apart is proportional to the distance between them.
From "A Brief History of Time: And Other Essays" by Stephen Hawking
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
