(adj) not pertinent to the matter under consideration, Syn. orthogonal, immaterial, impertinent, Example:an issue extraneous to the debate; the price was immaterial; mentioned several impertinent facts before finally coming to the point
(adj) not belonging to that in which it is contained; introduced from an outside source, Syn. foreign, Example:water free of extraneous matter; foreign particles in milk
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.