verb (used with object), rebutted, rebutting.
to refute by evidence or argument.
to oppose by contrary proof.
verb (used without object), rebutted, rebutting.
to provide some evidence or argument that refutes or opposes.

1250–1300; Middle English reb(o)uten < Old French rebouter, equivalent to re- re- + bouter to butt3

rebuttable, adjective
unrebuttable, adjective
unrebutted, adjective

1. deny, disapprove, disprove, rebut, refute (see synonym study at deny) ; 2. disapprove, disprove, rebut, refute.

1. disprove, confute. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
rebut (rɪˈbʌt)
vb , -buts, -butting, -butted
(tr) to refute or disprove, esp by offering a contrary contention or argument
[C13: from Old French reboter, from re- + boter to thrust, butt³]

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

c.1300, from O.Fr. rebuter "to thrust back," from re- "back" + boter "to thrust, hit" (see butt (v.)). Sense of "try to disprove, refute" is from 1817.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
They should not only study their own point of view, but be prepared to rebut
  the ideas of the opposing group.
Or, if you wish to rebut him, do so knowing that he is an army of one and that
  the community of reasonable thinkers has your back.
As medical researchers patiently rebut each argument, a new one arises.
He wants to rebut the notion that the amendment would forbid state courts from
  enforcing state laws that provide for civil unions.
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