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factor

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noun [countable] factor pronunciation in British English /ˈfæktə(r)/ 
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singularfactor
pluralfactors
  1. 1
    one of the things that influence whether an event happens or the way that it happens
    an important/major/key factor:

    Safety is the single most important factor in a car's design.

    risk factor (=something that may cause something dangerous or harmful):

    Lack of exercise is also a risk factor for heart disease.

    factor in:

    Public pressure was a factor in the government's decision.

    Synonyms and related words for this sense of factor
  2. 2
    a measurement that shows how strong or large something is

    Use a sun cream with a high protection factor.

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