Crossword Genius

A thousand million years (3)

Ross

I believe the answer is:

eon

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">a thousand million years</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 "Very long period (US and technical spelling)" , "Era" , "Long period of time" , "Very long age" , "Vast age; eternity" .)

I've seen this clue in The Times, The Sunday Times, The Sun and the Universal.
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