Etymology
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extraneous (adj.)

"not belonging or proper to a thing; not intrinsic or essential, though attached; foreign," 1630s, from Latin extraneus "external, strange," literally "that is without, from without" (as a noun, "a stranger"), from extra "outside of" (see extra-). A doublet of strange. Related: Extraneously.

updated on September 20, 2018

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Definitions of extraneous from WordNet

extraneous (adj.)
not essential;
the ballet struck me as extraneous and somewhat out of keeping with the rest of the play
extraneous (adj.)
not pertinent to the matter under consideration;
an issue extraneous to the debate
extraneous (adj.)
not belonging to that in which it is contained; introduced from an outside source;
water free of extraneous matter
Synonyms: foreign
extraneous (adj.)
coming from the outside;
extraneous light in the camera spoiled the photograph
relying upon an extraneous income
Synonyms: external / outside
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.