| ADJECTIVE | all | archaean, archean | of or relating to the earliest known rocks formed during the Precambrian Eon |
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| Meaning | Of or relating to the earliest known rocks formed during the Precambrian Eon. | |
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| Synonym | archean | |
| Category | geology | A science that deals with the history of the earth as recorded in rocks / rocks |
| Broader | early | At or near the beginning of a period of time or course of events or before the usual or expected time |
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