Meaning : Not pertinent to the matter under consideration.
Example :
An issue extraneous to the debate.
The price was immaterial.
Mentioned several impertinent facts before finally coming to the point.
Synonyms : immaterial, impertinent, orthogonal
Meaning : Not essential.
Example :
The ballet struck me as extraneous and somewhat out of keeping with the rest of the play.
Meaning : Not belonging to that in which it is contained. Introduced from an outside source.
Example :
Water free of extraneous matter.
Foreign particles in milk.
Synonyms : foreign