proportional
Americanadjective
-
having due proportion; corresponding.
- Synonyms:
- proportionate, consonant, accordant, harmonious
-
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.
-
(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.
-
adjective
-
of, involving, or being in proportion
-
maths having or related by a constant ratio
noun
Other Word 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
Looking to grow your vocabulary? Check out this interactive, curated word list from our team of English language specialists at Vocabulary.com – one of over 17,000 lists we've built to help learners worldwide!
Dear Martin
Interested in learning more words like this one? Our team at Vocabulary.com has got you covered! You can review flashcards, quiz yourself, practice spelling, and more – and it's all completely free to use!
Steve Jobs's Commencement Address (2005)
Want to remember this word for good? Start your learning journey today with our library of interactive, themed word lists built by the experts at Vocabulary.com – we'll help you make the most of your study time!
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.
An alternative is a system of proportional representation under which some attempt is made to distribute seats to reflect the popularity of parties.
From BBC • May 9, 2026
Both the Scottish Parliament and the Senedd in Wales use systems of proportional representation.
From BBC • May 9, 2026
The due diligence World Liberty conducted was proportional with the nature of its arrangement with AB and didn’t identify any sanctioned individuals, the lawyer said.
From The Wall Street Journal • Apr. 28, 2026
But rising oil prices this time around may not be able to directly translate into proportional gains in revenue or earnings for oil producers, according to market analysts.
From MarketWatch • Apr. 23, 2026
It defines the value of a telecommunications network, say, the Internet, as proportional to the square of the number of users.
From "A Deadly Wandering: A Mystery, a Landmark Investigation, and the Astonishing Science of Attention in the Digital Age" by Matt Richtel
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.
