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eon (noun) an extremely long period.
A period extending over thousands and thousands of years is an eon (also an aeon). The mythological stories and the figures in them last in the memories of people for eons, that is, for a long period. A great personís name lives on for eons, that is, for a long period of time even after their death.
- People shall remember for eons to come the adventures of King Arthur and his knights of the Round Table. That was at least the wish of Poet Tennyson who celebrated them in his poem.
- In the history of the universe, in the geological time scheme, eons which are too long for us, make only a short period.