Longman Dictionary of Contemporary English homepage

Date: 1300-1400
Language: Late Latin
Origin: fractio, from Latin fractus, past participle of frangere 'to break'

fraction

 noun
     
Related topics: Maths, Numbers
frac‧tion [countable]
1 a very small amount of something
fraction of
I got these shoes at a fraction of the original price.
She paused for a fraction of a second.
2HM a part of a whole number in mathematics, such as ½ or ¾
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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