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ratio

[rey-shoh, -shee-oh]
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noun, plural ra·tios.
  1. 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.
  2. proportional relation; rate: the ratio between acceptances and rejections.
  3. 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]
Latin.
  1. 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

Historical Examples

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

    Flying Machines

    W.J. Jackman and Thos. H. Russell

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

    Flying Machines

    W.J. Jackman and Thos. H. Russell

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

    Flying Machines

    W.J. Jackman and Thos. H. Russell

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

    The Rock of Chickamauga

    Joseph A. Altsheler

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

    The Railroad Question

    William Larrabee


British Dictionary definitions for ratio

ratio

noun plural -tios
  1. a measure of the relative size of two classes expressible as a proportionthe ratio of boys to girls is 2 to 1
  2. 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 in Medicine

ratio

(rāshō, rāshē-ō′)
n. pl. ra•tios
  1. Relation in degree or number between two similar things.
  2. 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 in Science

ratio

[rāshō, rāshē-ō′]
  1. 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 in Culture

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.