Longman Dictionary of Contemporary English homepage

revision

noun
     
re‧vi‧sion
1 [uncountable and countable] the process of changing something in order to improve it by correcting it or including new information or ideas [↪ amendment]
revision of
The judge wants to see a revision of the procedures.
revision to
I'm making some revisions to the book for the new edition.
2 [countable]ALTCN a piece of writing that has been improved and corrected
3 [uncountable] British EnglishSE the work of studying facts again in order to learn them:
I know I haven't done enough revision for tomorrow's exam.

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