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WordNet (r) 3.0 (2006) (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" [synonym: {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" [synonym: {extraneous}, {foreign}]
4: coming from the outside; "extraneous light in the camera
spoiled the photograph"; "relying upon an extraneous income";
"disdaining outside pressure groups" [synonym: {external},
{extraneous}, {outside}]