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• HADEAN AEON (noun) The noun HADEAN AEON has 1 sense: 1. the earliest eon in the history of the Earth from the first accretion of planetary material (around 4,600 million years ago) until the date of the oldest known rocks (about 3,800 million years ago); no evidence of life Familiarity information: HADEAN AEON used as a noun is very rare.
