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Hadean Time

American  
[hay-dee-uhn tahym] / heɪˈdi ən ˈtaɪm /

noun

  1. the oldest period of Earth's existence, starting with the formation of the planet around 4.6 billion years ago and ending around 3.8 billion years ago.

Hadean Time Scientific  
/ hā-dē′ən /

  1. The period of geologic time between 4.6 and 3.8 billion years ago, when the solar system was forming and the Earth was solidifying. No rocks are known from this time, as they were presumably eroded or drawn deep into the Earth and melted through the processes of plate tectonics.

  2. See Chart at geologic time

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.