Usually means: Noise Reduction Rating for hearing.
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We found 8 dictionaries that define the word NRR:

General (4 matching dictionaries)
  1. nrr: Wordnik
  2. NRR: Dictionary.com
  3. NRR: Wikipedia, the Free Encyclopedia
  4. NRR: Wiktionary

Computing (1 matching dictionary)
  1. NRR: Encyclopedia

Miscellaneous (2 matching dictionaries)
  1. NRR: Acronym Finder
  2. AbbreviationZ (No longer online)

Slang (1 matching dictionary)
  1. nrr: Urban Dictionary

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Definitions from Wiktionary (NRR)

▸ noun:  (cricket) Initialism of net run rate. [(cricket) The average run rate scored by a team minus the average run rate scored against them.]


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