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.

Nearby words

  1. rating,
  2. rating badge,
  3. rating nut,
  4. ratingen,
  5. ratiné,
  6. ratio scale,
  7. ratio test,
  8. ratiocinate,
  9. ratiocination,
  10. 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.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for ratio


British Dictionary definitions 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
maths a quotient of two numbers or quantitiesSee also proportion (def. 6)

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

Word Origin and History for ratio

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.

Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for ratio

ratio

[ rāshō, rāshē-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.

Science definitions for ratio

ratio

[ rāshō, rāshē-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.

Culture definitions for ratio

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.