Source : Webster's Revised Unabridged Dictionary (1913)

Extraneous \Ex*tra"ne*ous\, a. [L. extraneus, from extra. See
   {Extra-}, {Strange}.]
   Not belonging to, or dependent upon, a thing; without or
   beyond a thing; not essential or intrinsic; foreign; as, to
   separate gold from extraneous matter.

         Nothing is admitted extraneous from the indictment.
                                                  --Landor.
   -- {Ex*tra"ne*ous*ly}, adv.

Source : WordNet®

extraneous
     adj 1: not pertinent to the matter under consideration; "an issue
            extraneous to the debate"; "the price was immaterial";
            "mentioned several impertinent facts before finally
            coming to the point" [syn: {immaterial}, {impertinent},
             {orthogonal}]
     2: not essential; "the ballet struck me as extraneous and
        somewhat out of keeping with the rest of the play"
     3: not belonging to that in which it is contained; introduced
        from an outside source; "water free of extraneous matter";
        "foreign particles in milk" [syn: {foreign}]
     4: coming from the outside; "extraneous light in the camera
        spoiled the photograph"; "relying upon an extraneous
        income"; "disdaining outside pressure groups" [syn: {external},
         {outside}]