UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈreɪʃiəʊ/US:USA pronunciation: IPA and respellingUSA pronuncation: IPA/ˈreɪʃoʊ, -ʃiˌoʊ/ ,USA pronunciation: respelling(rāshō, -shē ō′)

Inflections of 'ratio' (nnoun: Refers to person, place, thing, quality, etc.): nplplural noun: Noun always used in plural form--for example, "jeans," "scissors.": ratios

WordReference Random House Learner's Dictionary of American English © 2020
ra•tio /ˈreɪʃoʊ, -ʃiˌoʊ/USA pronunciation   n.[countable]pl.  -tios. 
  1. Mathematicsthe relation between two numbers or amounts, with respect to the number of times the first contains the second:The ratio of 3 to 9 is the same as the ratio of 1 to 3.
  2. Mathematicsrate;
    proportion:The ratio of acceptances to rejections is very high.
See -ratio-.
-ratio-, root. 
  1. -ratio- comes from Latin, where it has the meaning "logic;
    judgment.'' This meaning is found in such words as: irrational, overrated, rate, ratify, ratio, ration, rational.

WordReference Random House Unabridged Dictionary of American English © 2020
ra•tio  (rāshō, -shē ō′),USA pronunciation n., pl.  -tios. 
  1. Mathematicsthe 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. Mathematicsproportional relation;
    rate:the ratio between acceptances and rejections.
  3. [Finance.]the relative value of gold and silver in a bimetallic currency system.
  • Latin ratiō a reckoning, account, calculation, derivative (see -tion) of the base of rērī to judge, think
  • 1630–40

Collins Concise English Dictionary © HarperCollins Publishers::
ratio /ˈreɪʃɪˌəʊ/ n ( 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. a quotient of two numbers or quantities
    See also proportion
Etymology: 17th Century: from Latin: a reckoning, from rērī to think; see reason
'ratio' also found in these entries:
Collocations: a [direct, correlative] ratio, the [efficiency, performance, productivity, coverage] ratio, finance: the [share, dividend, earnings] ratio, more...

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