Crossword puzzle clue "millennia upon millennia"

Here are the possible solutions for millennia upon millennia clue

Answer
Clue
Relevancy
aeon
Clue
Millennia upon millennia
Many millennia
Many, many millennia
Million-millennia period
Many a millennia
A million millennia (Var.)
Definition
the largest division of geological time, composed of several eras, also EON
eon
Clue
Millennia upon millennia
Definition
a long period of time, also AEON
adcampaign
Clue
Series of battles within the last two millennia?

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