noun
- 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).
- synonyms: Hadean, Hadean time, Hadean eon, Priscoan, Priscoan eon, Priscoan aeon
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| APA | WordNet. (2010). Hadean aeon. Retrieved September 21, 2026, from http://smartdefine.org/hadean_aeon/definitions/1283717 |
| Chicago | WordNet. 2010. "Hadean aeon" http://smartdefine.org/hadean_aeon/definitions/1283717 (accessed September 21, 2026). |
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| MLA | WordNet. "Hadean aeon" 23 October 2010. Web. 21 September 2026. <http://smartdefine.org/hadean_aeon/definitions/1283717> |