introduced or coming from without; not belonging or proper to a thing; external; foreign: extraneous substances in our water.
not pertinent; irrelevant: an extraneous remark; extraneous decoration.

1630–40; < Latin extrāneus external, foreign, equivalent to extr(a)- extra- + -ān(us) -an + -eus -eous

extraneously, adverb
extraneousness, noun
nonextraneous, adjective
nonextraneously, adverb
nonextraneousness, noun
unextraneous, adjective
unextraneously, adverb

extraneous, external, extrinsic, internal, intrinsic.

1. extrinsic, adventitious, alien. 2. inappropriate, nonessential, superfluous.

1. intrinsic. 2. pertinent, relevant.
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
extraneous (ɪkˈstreɪnɪəs)
1.  not essential
2.  not pertinent or applicable; irrelevant
3.  coming from without; of external origin
4.  not belonging; unrelated to that to which it is added or in which it is contained
[C17: from Latin extrāneus external, from extrā outside]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

1638, from L. extraneus, from extra "outside of."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Isn't it more often the case of subtracting the extraneous to arrive at the
  obvious .
If you remove what's extraneous, it all makes sense.
Many people might not want all this extraneous software cluttering up their
  hard drive.
He stripped it bare of all extraneous references, revealing only the essential
  light and clarity of its form.
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