Nullification (8)
I believe the answer is:
negation
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nullification</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for negation that I've seen before include "One giant turns out to be a denial" , "Contradiction" , "disagreement" , "Cancellation" , "Disaffirmation" .)