EPOCH definition in American English | Collins English Dictionary
https://www.collinsdictionary.com/us/dictionary/english/epoch
WEB5 days ago · 1. the beginning of a new and important period in the history of anything. the first earth satellite marked a new epoch in the study of the universe. 2. a period of time considered in terms of noteworthy and characteristic events, developments, persons, etc. an epoch of social revolution. 3. a point in time or a precise date. 4. Astronomy.
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