Eternity (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eternity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for eon that I've seen before include "Vast age (alt. sp.)" , "Geological period" , "billion years" , "thousand million years" , "Very long period (US and technical spelling)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eternity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for perpetuity that I've seen before include "In this is forever" , "In(de)finite duration" .)