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1. (adj.) Precambrian
noting or pertaining to the earliest era of earth history, ending 570 million years ago, during which the earth's crust formed and life first appeared in the seas.
2. (n.) Precambrian
the Precambrian Era.
Etymology: (1860–65)
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| Definition of 'precambrian' |
Princeton's WordNet |
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1. (noun) Precambrian, Precambrian eon, Precambrian aeon, Precambrian period
the eon following the Hadean time and preceding the Phanerozoic eon; from about 3,800 million years ago until 544 million years ago
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Definitions of precambrian 
