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revision

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noun British English pronunciation: revision /rɪˈvɪʒ(ə)n/ 
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singularrevision
pluralrevisions
  1. 1
    [uncountable] the process of changing, improving, or making additions to something such as a plan, law, or piece of writing

    He intends to undertake a major revision of the constitution.

    subject to revision (=likely to be changed):

    The article, of course, is subject to revision by the editors.

    1. a.
      [countable] a change, improvement, or addition that someone makes to something

      A total of 24 revisions to the draft basic law were proposed.

    2. b.
      [countable] something that has been changed, improved, or added to

      A major revision will be published in June.

      She's working on a revision of her original opera.

  2. 2
    [uncountable] British the work of studying for an examination
    revision for:

    I can't go out – I've got to do some revision for my exams.

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