From Longman Dictionary of Contemporary Englishaeonae‧on, eon /ˈiːən/ noun [countable] LONG TIMEan extremely long period of time
Examples from the Corpus
aeon• For an aeon of time the words meant nothing.• And the cast, leaping from aeon to aeon, does a remarkable job.• Minute after minute, aeon after aeon, Nothing lets up or develops.• For our decade-conscious brains, an event that happens only once per aeon is so rare as to seem a major miracle.• The seas powdering our bones like quartz, making sand, grinding our peace for us by the aeon. 