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1. Oxford American Dictionary

   epoch

   • IPA[ˈepək]

   美式

   • n.
     a period of time in history or a person's life, typically one marked by notable events or particular characteristics；the beginning of a distinctive period in the history of someone or something

   • noun: epoch, plural noun: epochs

2. • 釋義

   n.

   名詞

   • 1. a period of time in history or a person's life, typically one marked by notable events or particular characteristics the Victorian epoch
   • ▪ the beginning of a distinctive period in the history of someone or something welfare reform was an epoch in the history of U.S. social policy
   • ▪ a division of time that is a subdivision of a period and is itself subdivided into ages, corresponding to a series in chronostratigraphy the Pliocene epoch
   • ▪ an arbitrarily fixed date relative to which planetary or stellar measurements are expressed.