Refutation

n. rebuttal, act of disproving, act of proving false

In informal logic an objection, also known as a refutation, is a reason arguing against a premise, lemma or main contention. An objection to an objection is known as a rebuttal.
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Noun
1. the speech act of answering an attack on your assertions; "his refutation of the charges was short and persuasive"; "in defense he said the other man started it"
(synonym) defense, defence
(hypernym) answer
(hyponym) confutation
(derivation) refute, rebut
2. any evidence that helps to establish the falsity of something
(synonym) disproof, falsification
(hypernym) evidence, grounds
(hyponym) reductio ad absurdum, reductio
(derivation) refute, rebut
3. the act of determining that something is false
(synonym) falsification, falsifying, disproof
(hypernym) determination, finding
(derivation) refute, rebut, controvert

n. refutation, disproof, rebuttal

(n.)
The act or process of refuting or disproving, or the state of being refuted; proof of falsehood or error; the overthrowing of an argument, opinion, testimony, doctrine, or theory, by argument or countervailing proof.