1 [uncountable and countable]
the process of changing something in order to improve it by correcting it or including new information or ideas [↪ amendment]
The judge wants to see a revision of the procedures.
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.