quo war·ran·to /ˌkwowəˈrɑn(ˌ)to, ˈræn; ˈwɔrənˌto, ˈwɑr-/
  Quo war·ran·to  Law A writ brought before a proper tribunal, to inquire by what warrant a person or a corporation acts, or exercises certain powers.
  Note: ☞ An information in the nature of a quo warranto is now common as a substitute for the writ.
  --Wharton.
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  quo warranto
       n : a hearing to determine by what authority someone has an
           office or franchise or liberty