Usually means: Effective number of neutrino species.
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We found 9 dictionaries that define the word Neff:

General (5 matching dictionaries)
  1. Neff: Wordnik
  2. Neff: Wiktionary
  3. NEFF: Dictionary.com
  4. NEFF, Neff: Wikipedia, the Free Encyclopedia
  5. Neff: Rhymezone

Miscellaneous (3 matching dictionaries)
  1. baby names list (No longer online)
  2. NEFF: Acronym Finder
  3. AbbreviationZ (No longer online)

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

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Definitions from Wiktionary (Neff)

▸ noun:  A surname.

Similar:
Nebb, Neese, McNeff, Nees, Nehls, Neece, neer, neeb, Neifert, Neech, more...

Phrases:
felix neff, Lucas Neff, Jolanda Neff, Neff GmbH, Kristin Neff, more...

Adjectives:
effective, 4600-5299, 4200-4599, former, late, refractive, 4100-4199, sester, young

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Similar:
Nebb, Neese, McNeff, Nees, Nehls, Neece, neer, neeb, Neifert, Neech, more...

Phrases:
felix neff, Lucas Neff, Jolanda Neff, Neff GmbH, Kristin Neff, Pennoyer v. Neff, Wallace Neff, more...

Adjectives:
effective, 4600-5299, 4200-4599, former, late, refractive, 4100-4199, sester, young



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