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AA
+++++ atomic absorption
+++/- Alcoholics Anonymous
++/-- antiaircraft
AcroLexic: Dictionary of Acronyms and Abbreviations contains 73 more definitions of “AA”.
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See also

Acronym Definitions
CAA 35
AAA 31
AAC 27
AAS 25
AAP 23
SAA 22
AACA 20
AAE 18
AAT 18
MAA 18
AAR 17
AAM 16
FAA 16
DAA 16
NAA 14
RAA 13
IAA 13
EAA 13
AACC 12
AAL 12