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Meaning of D region | Babel Free

Noun CEFR B2

Definitions

The innermost layer of the ionosphere, located 48 km (30 mi) to 90 km (56 mi) above the surface of the Earth.

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

d sharp D valve d-amphetamine D-bag d-beat d-block