Cambridge Advanced Learner's Dictionary
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Definition
fraction noun
/ˈfræk.ʃən/ n [C]
a number that results from dividing one whole number by another, or a small part of something
¼ and 0.25 are different ways of representing the same fraction.
Although sexual and violent crimes have increased by 10%, 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.
(Definition of fraction noun from the Cambridge Advanced Learner's Dictionary)

