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English - English (Wordnet) dictionary (also found in English - Vietnamese, Computing (FOLDOC))
epoch
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Noun
  • a unit of geological time that is a subdivision of a period and is itself divided into ages
  • (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
  • a period marked by distinctive character or reckoned from a fixed point or event
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