Crossword puzzle clue "beginning of era or long time period"

Here are the possible solutions for beginning of era or long time period clue

Answer
Clue
Relevancy
eon
Clue
Long long long long long long long time
Long, long, long time period
Long, long time period
Definition
a long period of time, also AEON
epoch
Clue
Beginning of era or long time period
Definition
an important period of time, also EPOCHA
aeon
Clue
Era after era after era
Long, long time period (var.)
Era after era
Definition
the largest division of geological time, composed of several eras, also EON
thelettere
Clue
"I'm the beginning of eternity, the end of time and space, the beginning of the end, and the end of every place ..."

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