coming from the outside
"extraneous light in the camera spoiled the photograph"
"relying upon an extraneous income"
"disdaining outside pressure groups"
not belonging to that in which it is contained
introduced from an outside source
"water free of extraneous matter"
"foreign particles in milk"
"the ballet struck me as extraneous and somewhat out of keeping with the rest of the play"
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"