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Noun: epoch (epochs)  e-puk or 'e,pók [N. Amer], 'ee,pók or 'e,pók [Brit]
  1. A period marked by distinctive character or reckoned from a fixed point or event
    - era
     
  2. (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded
    - date of reference
     
  3. A unit of geological time that is a subdivision of a period and is itself divided into ages

Derived forms: epochs

Type of: date, geologic time, geological time, period, period of time, time period

Part of: geological period, period

Encyclopedia: Epoch