Definition of fraction noun from the Oxford Advanced American Dictionary

     

    fraction

     noun
    noun
    NAmE//ˈfrækʃn//
     
     
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  1. 1 a small part or amount of something Only a small fraction of a bank's total deposits will be withdrawn at any one time.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 U.S.use leaded gasoline.If it is used with a singular noun that represents a group of people, the verb is usually singular:A tiny fraction of the population never votes.
  2. 2a division of a number, for example ⅝ see also common fraction synonym rational number compare integer
  3. 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 spent socializing. Socializing accounts for/makes up/comprises about 20% of leisure time. Students spend twice as much time playing computer games as playing sports. 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.
See the Oxford Advanced Learner's Dictionary entry: fraction