Reason, justification (9)
I believe the answer is:
rationale
<span class="explanation-format__ClueExplanation">I believe this is a double definition.<br/ ><br/ >'<span class="explanation-format__original">reason</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">justification</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I know that justification can be written as rationale)</span><br/ ><br/ ></span>
(Other definitions for rationale that I've seen before include "Motivation" , "grounds?" , "Why regulate" , "Basis of logic" , "justification" .)