# ratio

[rey-shoh, -shee-oh] /ˈreɪ ʃoʊ, -ʃiˌoʊ/
noun, plural ratios.
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.
Origin of ratio
1630-1640
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.
1.
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 Dictionary, © Random House, Inc. 2016.
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Examples from the Web for ratio
Contemporary Examples
• Pundit Niall Ferguson constructed a Twitter-based index that calculates relative prestige as the ratio of tweets to followers.

November 6, 2013
• There is debate among economists and social scientists about which ratio is the most accurate.

April 26, 2014
• The ratio tends to be steady--a little lower in recessions, a litlte higher in booms.

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

December 13, 2014
• Only 23 percent favored and 71 percent opposed, a ratio of over 3-to-1 against Amendment 1.

Historical Examples
• And when we multiply a ratio by √5, what is the meaning of this operation?

David Eugene Smith
• Suppose we would fix the ratio at any other than the ratio of July 14th, 1870.

C. A. Bogardus
• ratio et consilium propri ducis artes—Thought and deliberation are the qualities proper to a general.

• And why may we not continue that ratio far beyond that period?

Abraham Lincoln
• Flint glass effects a greater dispersion than crown glass nearly in the ratio of three to two.

Garrett Serviss
British Dictionary definitions for ratio

## ratio

/ˈreɪʃɪˌəʊ/
noun (pl) -tios
1.
a measure of the relative size of two classes expressible as a proportion: the ratio of boys to girls is 2 to 1
2.
(maths) a quotient of two numbers or quantities See also proportion (sense 6)
Word Origin
C17: from Latin: a reckoning, from rērī to think; see reason
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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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.

Online Etymology Dictionary, © 2010 Douglas Harper
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ratio in Medicine

ratio ra·tio (rā'shō, rā'shē-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.

The American Heritage® Stedman's Medical Dictionary
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ratio in Science
 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
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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.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
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### Difficulty index for ratio

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### Word Value for ratio

5
5
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