Meaning of supergrade | Babel Free
Definitions
Of plutonium: containing a very small portion of isotopes other than plutonium-239 (especially plutonium-240) (less than perhaps 3%), making the plutonium especially suitable for nuclear weapons
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.