| NOUN | time | Proterozoic eon, Proterozoic, Proterozoic aeon | from 2,500 to 544 million years ago |
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| Meaning | From 2,500 to 544 million years ago; bacteria and fungi; primitive multicellular organisms. | |
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| Synonyms | Proterozoic, Proterozoic aeon | |
| Instance of | eon, aeon | The longest division of geological time |
| Part of | Precambrian, Precambrian eon, Precambrian aeon, Precambrian period | The eon following the Hadean time and preceding the Phanerozoic eon |
| Spanish | proterozoico, Proterozoico | |
| Catalan | Proterozoic | |
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