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Definitions:
Noun
Hadean
Hadean time
Hadean eon
Hadean aeon
Priscoan
Priscoan eon
Priscoan aeon
Definition: 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