Crossword puzzle clue "one spelling of a billion years"

Here are the possible solutions for one spelling of a billion years clue

Answer
Clue
Relevancy
aeon
Clue
One spelling of a billion years
One billion years
One billion years (Var.)
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
One billion years
One billion years, in geology
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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