Billion-year span

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Now we are looking on the crossword clue: Billion-year span.
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Possible Answers: EON.

Random information on the term “EON”:

The word aeon /iːɒn/, also spelled eon, originally means “life” or “being”, though it then tended to mean “age”, “forever” or “for eternity”. It is a Latin transliteration from the koine Greek word ὁ αἰών (ho aion), from the archaic αἰϝών (aiwon). In Homer it typically refers to life or lifespan. Its latest meaning is more or less similar to the Sanskrit word kalpa and Hebrew word olam. A cognate Latin word aevum or aeuum (cf. αἰϝών) for “age” is present in words such as longevity and mediaeval.[1]
Taken from Wikipedia