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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 rocks Geology - general words the Precambrian     noun [S] the Precambrian period of time Geology - general words
(Definition of Precambrian adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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