the action or process of looking over something again, usually in order to improve it and/or make corrections;
e.g. She is busy with the revision of the article that is to be published.
(noun)
the action or process of studying something again;
e.g. The students were engaged in revision for their upcoming exam.
(noun)
a change made to something, typically in order to improve or correct it, or a changed version of something, typically meant to be an improvement on a previous version;
e.g. The professor gave the student feedback and asked him to submit a revision of the essay.