Dissimilarity (10)
I believe the answer is:
difference
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">dissimilarity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for difference that I've seen before include "Variation" , "Discrimination" , "Argument - dissimilarity" , "Diversity" , "Change" .)