| epoch | (noun) a period marked by distinctive character or reckoned from a fixed point or event | Synonyms: era |
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| (noun) a unit of geological time that is a subdivision of a period and is itself divided into ages | - |
| (noun) (astronomy) an arbitrarily fixed date that is the point in time relative to which information (as coordinates of a celestial body) is recorded | Synonyms: date of reference |
| epochal | (adjective) highly significant or important especially bringing about or marking the beginning of a new development or era | Synonyms: epoch-making |
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