Invariable (8)

I believe the answer is:
constant
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">invariable</span>' is the definition.<br/ ><span class="explanation-format__explanation">(associated in meaning)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for constant that I've seen before include "Always - faithful" , "Steady and unceasing" , "Endless" , "Persistent and unchanging" , "Changeless and unceasing" .)