[], (Adjective)

Definitions:


Phrases:

Origin:

[], (Noun)

Definitions:


Phrases:

Origin:

[ɑːˈkiːən], (Adjective)

Definitions:
- relating to or denoting the aeon that constitutes the earlier (or middle) part of the Precambrian, in which there was no life on the earth. It precedes the Proterozoic aeon and (in some schemes) is preceded by the Priscoan aeon
(e.g: the main basement rocks are Archaean gneiss)


Phrases:

Origin:
late 19th century: from Greek arkhaios ‘ancient’ + -an

[ɑːˈkiːən], (Noun)

Definitions:
- the aeon that constitutes the earlier (or middle) part of the Precambrian aeon, or the system of rocks deposited during it
(e.g: these organisms evolved sometime near the onset of the Archaean)


Phrases:

Origin:
late 19th century: from Greek arkhaios ‘ancient’ + -an