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Dictionary Entries (20 more entries. View all »)
Dictionary.com Unabridged (v 1.1) - Cite This Source
ra·tio    Audio Help   [rey-shoh, -shee-oh] Pronunciation Key
–noun, plural -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.
[Origin: 1630–40; < L ratiō a reckoning, account, calculation, deriv. (see -tion) of the base of rérī to judge, think]
Dictionary.com Unabridged (v 1.1)
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2006.

Encyclopedia Articles (566 more entries. View all »)
Columbia Electronic Encyclopedia - Cite This Source

ratio. The ratio of two quantities expressed in terms of the same unit is the fraction that has the first quantity as numerator and the second as denominator. For example, if in a group of 100 people 5 die, the ratio of deaths to the total number in the group is 5/100=1/20=.05. Ratios are indicated also by writing the two values with a colon between them, e.g., the ratio of 4 to 8 can be expressed by 4:8 as well as by 4/8.

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