ratio
noun
ra·tio
ˈrā-shē-ˌō 
-(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
Well-qualified buyers, meaning those with strong credit, stable income and lower debt-to-income ratios, may find opportunities to secure even better pricing by comparing offers from multiple lenders.
—
Angelica Leicht, CBS News, 29 Dec. 2025
Versus the 200-day MA, the AVB/SPX ratio sits at least 20% below its own 200-day MA, an oversold extreme last seen in 2020 and 2009.
—Katie Stockton, CNBC, 29 Dec. 2025
There are a few differences, though — specifically, a slightly higher carbon-dioxide-to-water ratio, and a little more nickel than iron, which reflect the chemical composition of its star system of origin.
—Keith Cooper, Space.com, 28 Dec. 2025
The sweet chocolate icing-to-cake ratio is more than worth the nervous sweat.
—Kaitlyn Yarborough, Southern Living, 28 Dec. 2025
See All Example Sentences for ratio
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Angelica Leicht, CBS News, 29 Dec. 2025
Versus the 200-day MA, the AVB/SPX ratio sits at least 20% below its own 200-day MA, an oversold extreme last seen in 2020 and 2009.
—Katie Stockton, CNBC, 29 Dec. 2025
There are a few differences, though — specifically, a slightly higher carbon-dioxide-to-water ratio, and a little more nickel than iron, which reflect the chemical composition of its star system of origin.
—Keith Cooper, Space.com, 28 Dec. 2025
The sweet chocolate icing-to-cake ratio is more than worth the nervous sweat.
—Kaitlyn Yarborough, Southern Living, 28 Dec. 2025
See All Example Sentences for ratio
Cite this Entry
“Ratio.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/ratio. Accessed 31 Dec. 2025.
Copy CitationKids Definition
ratio
noun
ra·tio
ˈrā-shō
-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
ra·tio
ˈrā-(ˌ)shō, -shē-ˌō
plural ratios
: the relationship in quantity, amount, or size between two or more things see sex ratio
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