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NAS
+++++ National Academy of Sciences
+/--- National Airspace System
+---- Naval Air Station
AcroLexic: Dictionary of Acronyms and Abbreviations contains 18 more definitions of “NAS”.
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See also

Acronym Definitions
NASC 8
NASS 6
NASP 5
NASCOM 5
GLONASS 4
NASA 4
NASDAQ 3
NASM 3
NASD 3
NASN 3
NASDA 3
RNAS 2
NASBA 2
NASAO 2
NASAA 2
NASCOP 2
INAS 2
NASTRAN 2
NASI 2
CONASUPO 2