proportional

1 of 2

noun

pro·​por·​tion·​al prə-ˈpȯr-shnəl 

-shə-nᵊl

: a number or quantity in a proportion

proportional

2 of 2

adjective

1

a

: corresponding in size, degree, or intensity

b

: having the same or a constant ratio

corresponding sides of similar triangles are proportional

2

: regulated or determined in size or degree with reference to proportions

a proportional system of immigration quotas

a proportional font/typeface [=a font/typeface with characters of various widths]

proportionality

prə-ˌpȯr-shə-ˈna-lə-tē 

noun

proportionally

prə-ˈpȯr-shnə-lē 

-shə-nᵊl-ē

adverb

Synonyms

Adjective

• commensurable
• commensurate
• proportionate

Examples of proportional in a Sentence

Adjective

The features of the face in the drawing are proportional.

the website's popularity increased exponentially, resulting in a proportional increase in advertising revenue

Recent Examples on the Web

Noun

Each electron wave has a momentum that is inversely proportional to its wavelength and a kinetic energy proportional to the square of its momentum. —Douglas Natelson, Scientific American, 19 Mar. 2024

Compensation proportional to the number of cows on a farm might be more persuasive. —Céline Gounder, STAT, 17 May 2024

Adjective

This means that alleviation of the disease could be proportional to its psychological component. —Kyle J. Russell, USA TODAY, 6 Sep. 2024

Because global warming is proportional to cumulative greenhouse gas emissions, and emissions from the U.S. substantially exceed those of any other nation, the U.S. government, particularly HHS, has an outsized responsibility to end its dependence on fossil fuels. —David Introcaso, STAT, 15 Aug. 2024

Word History

Etymology

Noun

borrowed from Late Latin prōportiōnāle, noun derivative from neuter of prōportiōnālis proportional entry 2

Adjective

Middle English proporcional, proporcionel, borrowed from Middle French & Late Latin; Middle French proporcionel, borrowed from Late Latin prōportiōnālis, from Latin prōportiōn-, prōportiō "analogy, proper spatial relation between parts" + -ālis -al entry 1 — more at proportion entry 1

First Known Use

Noun

1570, in the meaning defined above

Adjective

14th century, in the meaning defined at sense 1a

Phrases Containing proportional

• directly proportional
• inversely proportional
• mean proportional
• proportional font/typeface
• proportional parts
• proportional representation
• proportional tax

Kids Definition

proportional

adjective

pro·​por·​tion·​al

p(r)ə-ˈpōr-shnəl,

-ˈpȯr-,

-shən-ᵊl

1

a

: being equivalent in size, amount, or strength

b

: having the same or a constant ratio

2

: set with reference to proportions

proportionality

-ˌpōr-shə-ˈnal-ət-ē

-ˌpȯr-

noun

proportionally

-ˈpōr-shnə-lē

-ˈpȯr-

-shən-ᵊl-ē

adverb