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1. Not constituting an essential or vital element or part: school rules forbidding extraneous clothing like hats.
2. Unrelated to the topic or matter at hand. See Synonyms at irrelevant.
3. Coming from the outside: extraneous noise.

[From Latin extrāneus, from extrā, outside; see extra-.]

ex·tra′ne·ous·ly adv.
ex·tra′ne·ous·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.extraneousness - unrelatedness by virtue of falling outside the matter at hand
unrelatedness - the lack of any particular manner of connectedness
References in periodicals archive ?
In the previous list, one could add translations for each term into the other language, but, with the list's length and extraneousness, the act seems unimportant.
This clerical vacuity imposes onto the events of life the same feeling of extraneousness that inheres to artistic endeavor in Oeuvres: what is considered is not the momentary, irreducible surge of feeling, but the outer form and its logical propensity.
The fact that it seems so easy to summarize the plot without mentioning the bowl (18) says something about the extraneousness, even clumsiness, critics often ascribe to this device.
The argument on the reciprocal extraneousness of the two philosophical texts can be followed even further.