noun (n)

• the state of being physically constrained(noun.state)

  Synonym:
  restraint
  

  source: wordnet30
• a device that retards something's motion(noun.artifact)

  source: wordnet30
• the act of constraining; the threat or use of force to control the thoughts or behavior of others(noun.act)

  source: wordnet30
• The act of constraining, or the state of being constrained; that which compels to, or restrains from, action; compulsion; restraint; necessity.(noun)

  source: webster1913