Crossword puzzle clue "lengthy historical period"

Here are the possible solutions for lengthy historical period clue

Answer
Clue
Relevancy
era
Clue
Lengthy historical period
Lengthy time period, historically
Definition
a main division of geological time
eras
Clue
Lengthy historical periods
Definition
ERA, a main division of geological time
aol
Clue
Lengthy period
coma
Clue
Lengthy period of unconsciousness
Definition
(Latin) a spherical cloud of material surrounding the head of a comet
eon
Clue
Lengthy period
Definition
a long period of time, also AEON
lifetime
Clue
Lengthy guarantee period
Definition
the period of living existence
term
Clue
In the long ___ (over a lengthy period)

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