counterclaim

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counterclaim

Etymology: L, contra, against, clamere, to cry out
(in law) a claim made by a defendant establishing a cause for action in his or her favor against a plaintiff. The purpose of a counterclaim is to oppose or detract from a plaintiff's claim or complaint.
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Interdent and Premier counterclaimed that the BriteSmile patent was invalid and unenforceable due to fraud.
Magnetic Resonance Plus counterclaimed, alleging that FONAR had violated the Federal antitrust laws and tortiously interfered with Magnetic Resonance Plus' contracts and prospective economic advantage.