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.
Extra Tips For Best Results To get the most out of using vinegar in your laundry, here are a few extra tips to make sure your clothes come out soft and fresh every time: Always dilute your vinegar with water, preferably a 1:1 ratio, to prevent unexpected damage. Ashlyn Needham, Southern Living, 2 Aug. 2025 As a point of reference, from his first appearance after being acquired last year, Tanner Scott recorded four saves while Suárez notched 13 after August 3, setting a baseline for Miller, who can still accrue ancillary saves while racking up strikeouts and protecting a team’s ratios. Greg Jewett, New York Times, 1 Aug. 2025 Hence, the stock currently has an EV/EBITDA ratio of 2.4, which pales in comparison to its sector (8.4) and adjusted 5-year (4.5) averages. John Choong, Forbes.com, 1 Aug. 2025 McGreevy has a 19-to-5 strikeout-to-walk ratio in 33 innings this year. Jeff Sanders, San Diego Union-Tribune, 1 Aug. 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 5 Aug. 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

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