# ratio

[ rey-shoh, -shee-oh ]

/ ˈreɪ ʃoʊ, -ʃiˌoʊ /

### noun, plural ra·tios.

the relation between two similar magnitudes with respect to the number of times the first contains the second: the ratio of 5 to 2, written 5:2 or 5/2.

proportional relation; rate: the ratio between acceptances and rejections.

Finance. the relative value of gold and silver in a bimetallic currency system.

## RELATED CONTENT

## RELATED WORDS

rate, scale, proportion, quota, correspondence, relationship, equation, arrangement, fraction, correlation, quotient, proportionality

## Nearby words

- rating,
- rating badge,
- rating nut,
- ratingen,
- ratiné,
- ratio scale,
- ratio test,
- ratiocinate,
- ratiocination,
- ratiometer

## Origin of ratio

1630–40; < Latin ratiō a reckoning, account, calculation, derivative (see -tion) of the base of rērī to judge, think

## ultima ratio regum

[ oo l-ti-mah rah-tee-oh rey-goo m; English uhl-tuh-muh rey-shee-oh ree-guh m ]

/ ˈʊl tɪˌmɑ ˈrɑ tiˌoʊ ˈreɪ gʊm; English ˈʌl tə mə ˈreɪ ʃiˌoʊ ˈri gəm /

### Latin.

the final argument of kings (a resort to arms): motto engraved on the cannon of Louis XIV.

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Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

## Examples from the Web for ratio

## ratio

/ (ˈreɪʃɪˌəʊ) /

### noun plural -tios

a measure of the relative size of two classes expressible as a proportionthe ratio of boys to girls is 2 to 1

## Word Origin for ratio

C17: from Latin: a reckoning, from rērī to think; see reason

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

## ratio

1630s, "reason, rationale," from Latin ratio "reckoning, numbering, calculation; business affair, procedure," also "reason, reasoning, judgment, understanding," from rat-, past participle stem of reri "to reckon, calculate," also "think" (see reason (n.)). Mathematical sense "relationship between two numbers" is attested from 1650s.

Online Etymology Dictionary, © 2010 Douglas Harper

## ratio

[ rā′shō, rā′shē-ō′ ]

### n. pl. ra•tios

Relation in degree or number between two similar things.

The relation between two quantities expressed as the quotient of one divided by the other.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

## ratio

[ rā′shō, rā′shē-ō′ ]

A relationship between two quantities, normally expressed as the quotient of one divided by the other. For example, if a box contains six red marbles and four blue marbles, the ratio of red marbles to blue marbles is 6 to 4, also written 6:4. A ratio can also be expressed as a decimal or percentage.

The American Heritage® Science Dictionary
Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

## ratio

[ (ray-shee-oh, ray-shoh) ]

An expression of the relative size of two numbers by showing one divided by the other.

The New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.