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Definition of epoch:

  1. A division of time characterized by the prevalence of similar conditions of the earth; commonly a minor division or part of a period.
  2. A fixed point of time, established in history by the occurrence of some grand or remarkable event; a point of time marked by an event of great subsequent influence; as, the epoch of the creation; the birth of Christ was the epoch which gave rise to the Christian era.
  3. A period of time, longer or shorter, remarkable for events of great subsequent influence; a memorable period; as, the epoch of maritime discovery, or of the Reformation.
  4. An arbitrary fixed date, for which the elements used in computing the place of a planet, or other heavenly body, at any other date, are given; as, the epoch of Mars; lunar elements for the epoch March 1st, 1860.
  5. The date at which a planet or comet has a longitude or position.

Synonyms:

milestone, geochemistry, sequence, chapter, block, erode, era, succession, deposition, earned run average, carve, countdown, distance, geological era, geology, geological, deposit, geologist, delay, date of reference, while, erosion, study at period.

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