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History
History
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Meaning:
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a relation between two amounts determined by the number of times one contains the other

percentage, relation of part to whole

proportion quota rate scale arrangement correlation correspondence equation fraction proportionality quotient relationship
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Cases of word usage

1) (also Mach number) the ratio of the air speed of an aircraft to the speed of sound (mach)

RATIO as in Wiktionary
RATIO as in Wikipedia