Crossword puzzle clue "about a billion years"

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Answer
Clue
Relevancy
ages
Clue
Years and years and years
Definition
AGE, to grow old
eon
Clue
Years and years and years
Definition
a long period of time, also AEON
eons
Clue
Years and years and years
Definition
EON, a long period of time, also AEON
aeon
Clue
A billion years
One billion years
Billion years
A billion years (Var.)
Billion years (Var.)
Definition
the largest division of geological time, composed of several eras, also EON

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