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Archaean Common

Archaean has 4 different meanings across 2 categories:

Adjective · Proper Noun

Definitions
Noun
1

Any organism of the domain Archaea.

Adjective
1

of or relating to the earliest known rocks formed during the Precambrian Eon

2

Of, or relating to the geologic eon from about 3,800 to 2,500 million years ago; comprises the Eoarchean, Paleoarchean, Mesoarchean and Neoarchean eras; marked by an atmosphere with little oxygen, the formation of the first continents and oceans and the emergence of simple life.