# Hadean

> English word · Proper noun · IPA /heɪˈdiːən/

## Definitions
1. The Hadean eon; part of the Precambrian supereon, spanning from around 4.6 to 4 billion years ago.

## Etymology
From Hades + -an, from Ancient Greek ᾍδης (Hāídēs). By surface analysis, had- + -e- + -an.

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