# Hadean time

> English word · Proper noun

## Definitions
1. The geologic eon from about 4,600 to 3,800 million years ago, marked by the formation of the first rocks.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/hadean-time