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English definition of “Precambrian”

Precambrian

adjective     /ˌpriːˈkæm.bri.ən/ specialized
from or referring to the earliest period of time, between about 4,600 and 543 million years ago, from when the Earth was formed until the first simple forms of life appeared: Precambrian time Precambrian rocksGeology - general words the Precambrian     noun [S] the Precambrian period of timeGeology - general words
(Definition of Precambrian adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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