noun (n)

• an event that occurs when something passes from one state or phase to another(noun.event)

  Synonym:
  change, modification
  

  source: wordnet30
• the act of making something different (as e.g. the size of a garment)(noun.act)

  Synonym:
  adjustment, modification
  

  source: wordnet30
• the act of revising or altering (involving reconsideration and modification)(noun.act)

  Synonym:
  revision
  

  source: wordnet30
• The act of altering or making different.(noun)

  source: webster1913