ra·​tio | \ ˈrā-(ˌ)shō How to pronounce ratio (audio) , -shē-ˌō \
plural ratios

Definition of ratio

1a : the indicated quotient of two mathematical expressions
b : the relationship in quantity, amount, or size between two or more things : proportion
2 : the expression of the relative values of gold and silver as determined by a country's currency laws

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Synonyms for ratio


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Examples of ratio in a Sentence

What is the length-to-width ratio? the ratio of students to teachers in the school is nine to one
Recent Examples on the Web This is compared to the average ratio of 9.05 ng/ml in postmortem cases and 3.2 ng/ml in driving under the influence cases of people who survive. Paul Walsh, Star Tribune, "Medical expert: 'In a vise,' George Floyd did everything he could as he struggled to breathe," 8 Apr. 2021 Companies with half or more of executives exhibiting digital prowess have 48% higher revenue growth and higher valuations (share price to sales ratio) and 15% higher net margins than the rest, Weill and his co-authors find. Joe Mckendrick, Forbes, "Your CEO, And Even Your CIO, May Need Digital Skills Refreshes," 7 Apr. 2021 Their servings are huge and their bread to meat ratio is perfect. Mike Rose, cleveland, "Honey Hut’s Kevin Page shares some of his favorite local dining choices: Five for Friday," 25 Mar. 2021 This summer, the city is expanding to a ratio of 15 campers to one adult, Early said. Steven Walker, orlandosentinel.com, "Orlando summer camp options for kids will be limited, much like last year," 19 Mar. 2021 By holding banks to a minimum ratio, regulators effectively restrict them from making too many loans without increasing their capital levels. Andrew Ackerman, WSJ, "Fed to Decide on Extending Emergency Capital Relief for Big Banks," 12 Mar. 2021 The student to teacher ratio will not exceed 14 to 1 with 6,000 students and 428 teachers for 24 days. Kristen Griffith, baltimoresun.com/maryland/carroll, "Carroll County Public Schools to present multimillion-dollar plan for recovery," 10 Mar. 2021 In Big East play, Gillespie leads the league with 5.8 assists per game, and a 3.4 assists/TO ratio. Dom Amore, courant.com, "UConn men at No. 10 Villanova: What you need to know as the high-stakes, Big East showdown arrives," 20 Feb. 2021 While their teams split those contests, Mahomes has put up the better numbers with his 109.2 passer rating and 11-3 touchdown to interception ratio outpacing Brady’s 86 rating with six TDs and five interceptions. Josh Dubow, ajc, "Brady, Mahomes prepare for 5th matchup after splitting 1st 4," 31 Jan. 2021

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ratio.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ratio

1660, in the meaning defined at sense 1a

History and Etymology for ratio

Latin, computation, reason — more at reason entry 1

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Statistics for ratio

Last Updated

17 Apr 2021

Cite this Entry

“Ratio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ratio. Accessed 23 Apr. 2021.

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More Definitions for ratio



English Language Learners Definition of ratio

: the relationship that exists between the size, number, or amount of two things and that is often represented by two numbers


ra·​tio | \ ˈrā-shō How to pronounce ratio (audio) , -shē-ˌō \
plural ratios

Kids Definition of ratio

: the relationship in number or quantity between two or more things the ratio of teachers to students


ra·​tio | \ ˈrā-(ˌ)shō, -shē-ˌō How to pronounce ratio (audio) \
plural ratios

Medical Definition of ratio

: the relationship in quantity, amount, or size between two or more things — see sex ratio

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