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Open English Wordnet
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Nouns
(n)
era
,
epoch
a period marked by distinctive character or reckoned from a fixed point or event
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(n)
epoch
,
date of reference
(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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(n)
epoch
a unit of geological time that is a subdivision of a period and is itself divided into ages
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