Acronyms, Abbreviations, and Initialisms.
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The meaning of the Acronym NACK is...

NACK is

  • Negative ACKnowledge

More Meanings For NACK:

  • Negative ACKnowledge
  • Negative ACKnowledge
  • Negative ACKnowledge
  • Negative ACKnowledge
  • Network of Anyone Collecting Keychains

NACK is also in:

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