Definition of fraction noun from the Oxford Advanced Learner's Dictionary



    BrE BrE//ˈfrækʃn//
    ; NAmE NAmE//ˈfrækʃn//
    Mathematical terminology
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  1. 1a small part or amount of something Only a small fraction of a bank's total deposits will be withdrawn at any one time. She hesitated for the merest fraction of a second. He raised his voice a fraction. If fraction is used with a plural noun, the verb is usually plural:Only a fraction of cars in the UK use leaded petrol. If it is used with a singular noun that represents a group of people, the verb can be singular or plural in British English, but is usually singular in North American English:A tiny fraction of the population never vote/votes.
  2. 2a division of a number, for example ⅝ synonym rational number Language BankproportionDescribing fractions and proportions According to this pie chart, a third of students’ leisure time is spent watching TV. One in five hours is/​are spent socializing. Socializing accounts for/makes up/comprises about 20% of leisure time. Students spend twice as much time playing computer games as doing sport. Three times as many hours are spent playing computer games as reading. The figure for playing computer games is three times higher than the figure for reading. The largest proportion of time is spent playing computer games. compare integer see also vulgar fraction See related entries: Mathematical terminology
  3. Word Origin late Middle English: via Old French from ecclesiastical Latin fractio(n-) ‘breaking (bread)’, from Latin frangere ‘to break’.Extra examples A mere fraction of available wind energy is currently utilized. Express 25% as a fraction. The average income is high, though many people earn just a fraction of that average. Why not grow your own fruit at a fraction of the price? How do you express 25% as a fraction?
See the Oxford Advanced American Dictionary entry: fraction