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epoch
noun
a unit of geological time that is a subdivision of a period and is itself divided into ages
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ˈiːpɒk
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noun
a unit of geological time that is a subdivision of a period and is itself divided into ages
noun
a period marked by distinctive character or reckoned from a fixed point or event
noun
(astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
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