being more than is sufficient or required; excessive.
unnecessary or needless.
Obsolete. possessing or spending more than enough or necessary; extravagant.

1400–50; late Middle English < Latin superfluus, equivalent to super- super- + flu- (stem of fluere to flow) + -us -ous

superfluously, adverb
superfluousness, noun
unsuperfluous, adjective
unsuperfluously, adverb
unsuperfluousness, noun

1. extra; redundant. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
superfluous (suːˈpɜːflʊəs)
1.  exceeding what is sufficient or required
2.  not necessary or relevant; uncalled-for
3.  obsolete extravagant in expenditure or oversupplied with possessions
[C15: from Latin superfluus overflowing, from super- + fluere to flow]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source's 21st Century Lexicon
Main Entry:  superfluous1
Part of Speech:  adj
Definition:  more than enough; overabundant; extra
Etymology:  Latin super- + fluere 'to flow'
Main Entry:  superfluous2
Part of Speech:  adj
Definition:  unnecessary; uncalled-for; wasteful
Etymology:  Latin super- + fluere 'to flow''s 21st Century Lexicon
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Word Origin & History

c.1380 (superflue), from L. superfluus "unnecessary," lit. "overflowing," from superfluere "to overflow," from super "over" (see super-) + fluere "to flow" (see fluent).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
If people think the extra meeting is superfluous or unclear on its purpose,
  they can raise their objections for all to hear.
He may have felt any extra knowledge was superfluous.
Asking about the story played out in the game is a bit superfluous.
Indeed, so potent is their self-organization that it threatens to render
  superfluous the employer and the state.
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