Source : Webster's Revised Unabridged Dictionary (1913)

Extrajudicial \Ex`tra*ju*di"cial\, a.
   Out of or beyond the power authority of a court or judge;
   beyond jurisdiction; not valid as a part of a judicial
   proceeding; as, extrajudicial oaths, judgments, etc., are
   null and void. -- {Ex`tra*ju*di"cial*ly}, adv.

Extrajudicial \Ex`tra*ju*di"cial\, a.
   Out of or beyond the proper authority of a court or judge;
   beyond jurisdiction; not legally required. ``An extrajudicial
   opinion.'' --Hallam. -- {Ex`tra*ju*di"cial*ly}, adv.

Source : WordNet®

extrajudicial
     adj : beyond the usual course of legal proceedings; legally
           unwarranted; "an extrajudicial penalty"