# ratio

[rey-shoh, -shee-oh]

- 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.

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## 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]

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

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Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

## Related Words

ratescaleproportionquotacorrespondencerelationshipequationarrangementfractioncorrelationquotientproportionality## Examples from the Web for ratio

### Contemporary Examples

#### During an emergency that ratio could be allowed to drop to 8.5 people per orbit.

#### However, the Air Force is so strapped for people that the ratio has dropped below even that reduced level.

#### From that, they extracted the ratio of the number of deuterium atoms to the number of hydrogen atoms.

#### Two years ago, Asian American voters voted for Obama over Romney by a ratio of more than 3-to-1.

#### The beauty of the project comes from the ratio of professional artists, recreational artists, and just creative people.

### Historical Examples

#### This ratio is phenomenally large, and should not be taken as a guide by amateurs.

Flying MachinesW.J. Jackman and Thos. H. Russell

#### But few of us understand just what the ratio of increase is, or how it is caused.

Flying MachinesW.J. Jackman and Thos. H. Russell

#### Just what the ratio of the curve should be is a matter of contention.

Flying MachinesW.J. Jackman and Thos. H. Russell

#### Take any ratio of percentage you please and something should have got us.

The Rock of ChickamaugaJoseph A. Altsheler

#### Business will increase largely, and the ratio of expenses will decrease.

The Railroad QuestionWilliam Larrabee

## ratio

- a measure of the relative size of two classes expressible as a proportionthe ratio of boys to girls is 2 to 1
- maths a quotient of two numbers or quantitiesSee also proportion (def. 6)

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## Word Origin

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

## Word Origin and History for ratio

### n.

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.

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Online Etymology Dictionary, © 2010 Douglas Harper

## ratio

(rā′shō, rā′shē-ō′)- Relation in degree or number between two similar things.
- The relation between two quantities expressed as the quotient of one divided by the other.

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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.

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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.

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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.