Definition of epoch
1a
: an event or a time marked by an event that begins a new period or development
b
: a memorable event or date
2a
: an extended period of time usually characterized by a distinctive development or by a memorable series of events
b
: a division of geologic time less than a period and greater than an age
3
: an instant of time or a date selected as a point of reference (as in astronomy)
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Merriam-Webster unabridged
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The first known use of epoch was in 1614
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