1. (noun)eon, aeon the longest division of geological time Synonyms: aeon, eon
2. (noun)eon, aeon an immeasurably long period of time Synonyms: aeon, eon
3. (noun)eon, aeon (Gnosticism) a divine power or nature emanating from the Supreme Being and playing various roles in the operation of the universe Synonyms: aeon, eon