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Pre·cam·bri·an
 Precambrian
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- pronunciation:
- pri
kaem
bri
 n
- parts of speech:
- adjective, noun
| part of speech: |
adjective |
| definition: |
of, relating to, or designating the earliest geological era, ending approximately 600 million years ago, when the earth's crust was formed and the first evidence of life appeared.
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| part of speech: |
noun |
| definition: |
the Precambrian Era, or the rock formations that date from that time.
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