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Proper noun

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NAO

  1. (US, historical) Initialism of National Applications Office: a former agent of the United States Department of Homeland Security.
  2. (UK) Initialism of National Audit Office.
  3. Initialism of Nautical Almanac Office.

Noun

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NAO (uncountable)

  1. (climatology) Initialism of North Atlantic oscillation

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