noun (n)

• an act that changes the form or character or substance of something(noun.act)

  Synonym:
  transubstantiation
  

  source: wordnet30
• a qualitative change(noun.event)

  Synonym:
  shift, transformation
  

  source: wordnet30
• (physics) the change of one chemical element into another (as by nuclear decay or radioactive bombardment)(noun.event)

  Example:
  The transmutation of base metals into gold proved to be impossible.
  

  source: wordnet30
• The act of transmuting, or the state of being transmuted; as, the transmutation of metals.(noun)

  source: webster1913