Crossword puzzle clue "billion year time span"

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Here are the possible solutions for billion year time span clue

Answer
Clue
Relevancy
eon
Clue
Billion-year time span
Billion-year span
Span of a billion years
Billion-year time period
Definition
a long period of time, also AEON
eons
Clue
Billion-year time spans
Definition
EON, a long period of time, also AEON
cen
Clue
100-year time span (Abbr.)
week
Clue
Time's time span
aeon
Clue
Billion-year period
Definition
the largest division of geological time, composed of several eras, also EON

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