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NAA
++++- Nonattainment area
+++-- neutron activation analysis
+/--- National Association of Accountants
AcroLexic: Dictionary of Acronyms and Abbreviations contains 11 more definitions of “NAA”.
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See also

Acronym Definitions
NAAS 6
NAAP 4
NAAG 3
NAADA 2
NAAFA 2
NAAQS 2
NAAB 2
NAARS 2
NAAR 2
NAAF 2
NAACP 2
NAAI 2
NAADAC 2
NAAACPA 1
PGNAA 1
SNAAQS 1
INAA 1
NAAEC 1
ENAA 1
NAACCR 1