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vocabulary
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Both Uses of

epoch
in
A Tale of Two Cities

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Definition:
a significant period of time
The exact meaning of epoch depends upon its context. For example:
  • "an epoch of scientific discovery" -- an historical period
  • "during the Late Jurassic epoch" -- a unit of geological time smaller than a period and larger than an age
  • "the epoch moment of the photo" -- the time of an astronomical measurement