Adjective
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coming from the outside
"extraneous light in the camera spoiled the photograph"
"relying upon an extraneous income"
"disdaining outside pressure groups"
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not belonging to that in which it is contained
introduced from an outside source
"water free of extraneous matter"
"foreign particles in milk"
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not essential
"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"