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From Longman Dictionary of Contemporary English
Related topics: Maths, Numbers
fractionfrac‧tion /ˈfrækʃən/ ●●○ noun [countable]  1 AMOUNTa very small amount of somethingfraction of I got these shoes at a fraction of the original price. She paused for a fraction of a second.2 HMa part of a whole number in mathematics, such as ½ or ¾
Examples from the Corpus
fractionThe ratio of sample to population is normally expressed as a fraction, known as the sampling fraction.Computers can now do the same job at a fraction of the cost.If those expensive cherry tomatoes are your idea of heaven, why not grow your own at a fraction of the price?A microwave oven cooks food in a fraction of the time required by a normal oven.Employees' salaries are just a fraction of the total cost of the project.The interim dividend goes up a fraction to 3.1p, from 2.9p.In the plasma, the bicarbonate concentration comprises the second largest anion fraction, with chloride being the largest anion fraction.What I had done so far amounted to a mere fraction of nothing at all.a problem that affects only a small fraction of the total populationBy 1920 the fraction of eighteen-to twenty-one-year-olds in college had doubled to 8 percent.The disease affects only a tiny fraction of the population.But the passengers are only a tiny fraction of the population, basically its middle class.fraction ofI got these shoes at a fraction of the original price.
From Longman Business Dictionaryfractionfrac‧tion /ˈfrækʃən/ noun [countable] a very small amount of somethingGeneric versions of the drug sell for a fraction of the branded price.
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