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Meaning of Bortle scale | Babel Free

Noun CEFR B2

Definitions

A nine-level numeric scale that measures the night sky's brightness of a particular location.

CEFR level

B2

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

See also

Bortles Bortner Borton bortsch bortz Borucki