Hadean has 4 different meanings across 3 categories:
Noun · Adjective · Proper 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
of or relating to or characteristic of Hades or Tartarus
Pertaining to Hades or hell.
The eon before 4,000 Ma.