The Clue
Eras upon eras (3 letter answer)
The Answer
EON
Tags
Notes
The answer EON is very common and appears about once every 42 puzzles.
Related Clues
Eternity
Generations
Ages and ages
Big stretch
A billion years
Forever and a day
Geologic time
Geological division
Geological stretch
Geology term
Immeasurable period
It goes on and on
Lengthy period
Long stretch
Long time
Loooong wait
Many years
Phanerozoic, for instance
Quite a while
Seemingly forever
Span of time
Time on end
Time period
Unnumbered years
Untold centuries
Awfully long time
Geologic time period
Immeasurably long time
It's a big stretch
Long, long time
Long stretch of time
Many, many eras
Many, many moons
Millennium upon millennium
Period in the earth's history
Super-long time
Very long time
Years upon years
Years and years and years
What a waiting time may seem
Definition
EON as a noun:
1. (eon, aeon) = the longest division of geological time
2. (eon, aeon) = an immeasurably long period of time; "oh, that happened eons ago"
3. (eon, aeon) = (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe