noun (n)

• putting someone in prison or in jail as lawful punishment(noun.act)

  source: wordnet30
• the state of being imprisoned(noun.state)

  Example:
  The imprisonment of captured soldiers.
  

  Synonym:
  captivity, immurement, incarceration
  

  source: wordnet30
• the act of confining someone in a prison (or as if in a prison)(noun.act)

  Synonym:
  internment
  

  source: wordnet30