noun (n)

• the travel of a commuter(noun.act)

  Synonym:
  commuting
  

  source: wordnet30
• a warrant substituting a lesser punishment for a greater one(noun.communication)

  source: wordnet30
• (law) the reduction in severity of a punishment imposed by law(noun.act)

  Synonym:
  re-sentencing
  

  source: wordnet30
• the act of putting one thing or person in the place of another:(noun.act)

  Synonym:
  exchange, substitution
  

  source: wordnet30
• A passing from one state to another; change; alteration; mutation.(noun)

  source: webster1913