Definition of extraneous

• 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"
• not essential; "the ballet struck me as extraneous and somewhat out of keeping with the rest of the play"
• not belonging to that in which it is contained; introduced from an outside source; "water free of extraneous matter"; "foreign particles in milk"