Rebuttal witness

: a witness called upon to rebut evidence already presented
3  : one who is called on to be present at a transaction so as to be able to testify to its occurrence
: one who sees the execution of an instrument and signs it to confirm its authenticity <a ~ to a will>
4  : See also eyewitness<a ~ to an assault>
: to furnish or constitute proof or evidence

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Based on Merriam-Webster's Dictionary of Law ©2001.
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