noun (n)

• the act of revising or altering (involving reconsideration and modification)(noun.act)

  Example:
  It would require a drastic revision of his opinion.
  

  Synonym:
  alteration
  

  source: wordnet30
• the act of rewriting something(noun.communication)

  Synonym:
  rescript, revisal, revise
  

  source: wordnet30
• something that has been written again(noun.communication)

  Synonym:
  rescript, rewrite
  

  source: wordnet30
• The act of revising; reëxamination for correction; review; as, the revision of a book or writing, or of a proof sheet; a revision of statutes.(noun)

  source: webster1913