Precambrian Meaning in Cambridge English Dictionary
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Meaning of "Precambrian" - English Dictionary

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Precambrianadjective

uk   us   /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
the Precambrian
noun [S] uk   us  
the Precambrian period of time
(Definition of Precambrian from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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