Meaning of Orosirian | Babel Free
Definitions
Of a geologic period within the Paleoproterozoic era from about 2050 to 1800 million years ago.
not-comparable
CEFR level
B2
Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.
This word is part of the CEFR B2 vocabulary — upper intermediate level.