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Meaning of R99 | Babel Free

Noun CEFR C2

Definitions

  1. R99; Ellipsis of NIOSH R99.
    uncountable
  2. R99 standard
    uncountable
  3. R99 filter
    countable

CEFR level

C2
Mastery
This word is part of the CEFR C2 vocabulary — mastery level.
See all C2 English words →

See also

Ra ra'y RAA Raab Raabe RAAC

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