Crossword puzzle clue "billion years var"

Here are the possible solutions for billion years var clue

Answer
Clue
Relevancy
aeon
Clue
A billion years (Var.)
Billion years (Var.)
One billion years (Var.)
A billion years, in astronomy (Var.)
A billion years
Definition
the largest division of geological time, composed of several eras, also EON
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

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