Abbreviations beginning with a

AUCAssemblée de l'Union des Comores (French: Assembly of the Union of Comoros; Comoros)
Governmental

AUCAb Urbe Condita (From the founding of the city (Rome) in 753 BC)
International » Latin

AUCAnno Urbis Conditae
International » Latin

AUCAutodefensas Unidas De Colombia
International » Spanish

AUCAmerican University of the Caribbean
Medical » Physiology

AUCappropriate use criteria
Medical

AUCArea Under the Curve
Medical » Oncology

AUCAalborg University Center, Denmark
Miscellaneous

AUCAb Urbe Condita (Latin: From the Foundation of the City)
Miscellaneous

AUCActive Understeer Control
Miscellaneous » Automotive

AUCActual Use Code (land assessments)
Miscellaneous

AUCAdministrative Uniformity Committee
Miscellaneous » Unclassified

AUCAfrican Union Commission
Miscellaneous

AUCAitken University Centre (University of New Brunswick; Canada)
Miscellaneous

AUCAix Université Club (French: Aix University Club; Aix-en-Provence, France)
Miscellaneous

AUCAlberta Underwater Council
Miscellaneous » Unclassified

AUCAlberta Utilities Commission
Miscellaneous » Commissions

AUCAlgoma University College
Miscellaneous

AUCAlternate Universe Characters
Miscellaneous » Science Fiction