C2 a number that results from dividing one whole number by another: ¼ and 0.25 are different ways of representing the same fraction.FractionsWords meaning small pieces and amounts › a small part of something, or a small amount: Although sexual and violent crimes have increased by 13 percent, they remain only a tiny/small fraction of the total number of crimes committed each year. They can produce it at a fraction of the cost of (= much more cheaply than) traditional methods. Could you just move a fraction to the right, then I could get by?

(Definition of fraction from the Cambridge Advanced Learners Dictionary & Thesaurus
© Cambridge University Press)

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