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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:

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

age (part of speech: noun)

lastingness, generation, lifetime, longevity, oldness, eon

point of time (part of speech: noun)

month, second, century, decade, millisecond, day, minute, millennium, hour, term, microsecond, week, year, semester

duration (part of speech: noun)

cycle, age, interim, duration, measure, interval, spell, period, course, date, season, time, aeon, era, span

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