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Meaning of N99 | Babel Free

Noun CEFR A2

Definitions

N99; Ellipsis of NIOSH N99.
uncountable
N99 standard
uncountable
N99 filter
countable

CEFR level

A2

Elementary
This word is part of the CEFR A2 vocabulary — elementary level.

See also

NA Na-Dene na-na na. NAA Naab