ratio

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noun ra·tio \ˈrā-(ˌ)shō, -shē-ˌō\

Definition of ratio

plural

ratios

  1. 1a :  the indicated quotient of two mathematical expressionsb :  the relationship in quantity, amount, or size between two or more things :  proportion

  2. 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

  1. What is the length-to-width ratio?

  2. the ratio of students to teachers in the school is nine to one

Recent Examples of ratio from the Web

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.

Origin and Etymology of ratio

Latin, computation, reason — more at reason

Other Mathematics and Statistics Terms


RATIO Defined for English Language Learners

ratio

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noun

Definition of ratio for English Language Learners

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


RATIO Defined for Kids

ratio

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noun ra·tio \ˈrā-shō, -shē-ˌō\

Definition of ratio for Students

plural

ratios

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


Medical Dictionary

ratio

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noun ra·tio \ˈrā-(ˌ)shō, -shē-ˌō\

Medical Definition of ratio

plural

ratios

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



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