English dictionary eon meaning and definition Definition and meaning of eon at MeaningMonkey.org. eon meaning and definition in the English Dictionary. EON nounDefinition of eon (noun)the longest division of geological timesynonyms: aeonan immeasurably long period of time"oh, that happened eons ago"synonyms: aeon(Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universesynonyms: aeon Source: Princeton University Wordnet
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