ratio

play
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

Origin and Etymology of ratio

Latin, computation, reason — more at reason


First Known Use: 1660

Other Mathematics and Statistics Terms


RATIO Defined for English Language Learners

ratio

play
noun ra·tio \ˈrā-(ˌ)shō, -shē-ˌō\

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

play
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

play
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



Seen and Heard

What made you want to look up ratio? Please tell us where you read or heard it (including the quote, if possible).

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

WORD OF THE DAY

capable of being altered or controlled

Get Word of the Day daily email!

WORD GAMES

Take a 3-minute break and test your skills!

  • peter-bruegel-tower-of-babel-painting
  • What language does pajama come from?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ

Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!