To contradict, meet, or oppose by argument, plea, or countervailing proof.
overthrow by argument, evidence, or proof; "The speaker refuted his opponent's arguments"
to refute, oppose, counteract by evidence, argument or contrary proof.
Refute, defeat or take away the effect of an argument or assumption in a legal proceeding.
Evidence disproving other evidence previously given or reestablishing the credibility of challenged evidence. (See rejoinder.)
Evidence disproving evidence already given