fraction - definition and synonyms

noun [countable] 

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  1. 1
    a small part or amount of something
    fraction of:

    His investment is now worth only a fraction of its original value.

    a small/tiny fraction:

    Unions recruit only a small fraction of the workers.

    a fraction of a second/an inch:

    Joe glanced at her for a fraction of a second before answering.

  2. 2
    maths a division or part of a whole number, for example ½ or ¾