Crossword puzzle clue "lengthy time periods"

Here are the possible solutions for lengthy time periods clue

Answer
Clue
Relevancy
epochs
Clue
Lengthy time periods
Definition
EPOCH, an important period of time, also EPOCHA
eras
Clue
Lengthy periods
Lengthy historical periods
Definition
ERA, a main division of geological time
eon
Clue
Periods upon periods
Lengthy time
Very lengthy stretch of time
Lengthy time span
Incalculably lengthy span of time
Definition
a long period of time, also AEON

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