ratio

noun

ra·​tio ˈrā-shē-ˌō How to pronounce ratio (audio)
-(ˌ)shō
plural ratios
1
a
: 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

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
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
Nigeria lags even the continent's already low tax-to-GDP ratios. Newsweek Staff, MSNBC Newsweek, 3 June 2025 Although both companies maintain a similar cash position (4% of total assets), Eli Lilly's lower debt-to-equity ratio signals a healthier financial standing. Trefis Team, Forbes.com, 3 June 2025 His strikeout-to-walk ratio is the team’s third-best over the past 25 years, behind only Phil Hughes and Ryan. Dan Hayes, New York Times, 2 June 2025 Horsepower numbers get eyeballs, but power-to-weight ratio is the real metric that engineers keep an eye on, along with weight distribution. Erik Shilling, Robb Report, 29 May 2025 See All Example Sentences for ratio

Word History

Etymology

Latin, computation, reason — more at reason entry 1

First Known Use

1660, in the meaning defined at sense 1a

Time Traveler
The first known use of ratio was in 1660

Browse Nearby Words

Cite this Entry

“Ratio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ratio. Accessed 6 Jun. 2025.

Kids Definition

ratio

noun
ra·​tio ˈrā-shō How to pronounce ratio (audio)
-shē-ˌō
plural ratios
1
: the quotient of two numbers or mathematical expressions
the ratio of 6 to 3 may be expressed as 6:3, ⁶⁄₃, and 2
2
: the relationship in quantity, amount, or size between two or more things
women outnumbered men in the ratio of three to one

Medical Definition

ratio

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

More from Merriam-Webster on ratio

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