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English definition of “prehistoric”

prehistoric

adjective [not gradable]  /ˌpri·hɪsˈtɔr·ɪk, -ˈtɑr-/ us  
world history happening in the period of human history before there were written records: Painting originated in prehistoric times with murals drawn on cave walls.
(Definition of prehistoric from the Cambridge Academic Content Dictionary © Cambridge University Press)
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