Firmness (9)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">firmness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that stability is a type of firmness)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for stability that I've seen before include "State of being firmly fixed" , "not displayed by Humpty-Dumpty" , "Balance" , "Balanced, settled state" , "State of steadiness and reliability" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">firmness</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for solidity that I've seen before include "Substance" , "Firm quality" , "Firmness" .)