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ae·on [ee-uhn, ee-on] – noun 1. (in Gnosticism) one of a class of powers or beings conceived as emanating from the Supreme Being and performing various functions in the operations of the universe. 2. e·on [ee-uhn, ee-on] –noun a. an indefinitely long period of time; age. b. the largest division of geologic time, comprising two or more eras. c. Astronomy: one billion years.
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