[syn: external, extraneous, outside]
The Collaborative International Dictionary of English v.0.48:
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.
   [1913 Webster]
         Nothing is admitted extraneous from the indictment.
                                                  --Landor.
   -- Ex*tra"ne*ous*ly, adv.
   [1913 Webster]
WordNet (r) 3.0 (2006):
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: extraneous,
           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: extraneous, 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,
       extraneous, outside]
Moby Thesaurus II by Grady Ward, 1.0:
86 Moby Thesaurus words for "extraneous":
   accidental, added, additional, adrift, adventitious, alien, apart,
   barbarian, barbaric, barbarous, beside the mark, beside the point,
   beside the question, detached, disconnected, discrete, disjunct,
   disrelated, dissociated, exotic, exterior, external, extra,
   extraorganismal, extraterrestrial, extrinsic, foreign,
   foreign-born, immaterial, impersonal, impertinent, inadmissible,
   inapplicable, inapposite, inappropriate, inapt, incidental,
   incommensurable, incomparable, inconsequent, independent,
   inessential, insular, intrusive, irrelative, irrelevant, isolated,
   needless, nihil ad rem, nonessential, nonsubjective, not at issue,
   objective, off the subject, other, out of place, out-of-the-way,
   outland, outlandish, outlying, outside, outward, parenthetical,
   peripheral, pointless, remote, removed, segregate, separate,
   separated, strange, superfluous, supernumerary, ulterior,
   unaffiliated, unallied, unapt, unassociated, unconnected,
   unearthly, unessential, unfitting, unnecessary, unneeded,
   unrelatable, unrelated