Abbreviations beginning with a

AAAAAustralian Automotive Aftermarket Association
Regional » Australian

AAAAAnguilla Amateur Athletic Association
Sports » Athletics

AAAAAsian Amateur Athletics Association
Sports » Athletics

AAAAAthleticism Attitude Academics And Adversity
Sports » Athletics

AAAA&IAmerican Academy of Allergy, Asthma, and Immunology
Academic & Science

AAAAAAnderson African American Alumni Association
Academic & Science » Alumni

AAAAAAssociation Amicale des Anciens d'Air Alpes (French airline, Chambéry, France)
Business

AAAAAAmerican Association Against Alliteration Abuse
Community » Associations

AAAAAAnderson African American Alumni Association
Community » Associations

AAAAAAnonym Association Against Acronym Abuse
Community » Associations

AAAAAAHo's Amazing Atlas of Antibody Anatomy
Medical » Laboratory

AAAAAAlways Active Art Awesomeness Algorithm
Miscellaneous » Unclassified

AAAAAAmerican Association Against Acronym Abuse
Miscellaneous » Funnies

AAAAAAmerican Association Against Alliteration Abuse (humor)
Miscellaneous

AAAAAAmerican Association for Awesomely Annoying Abbreviations
Miscellaneous » Funnies

AAAAAAmerican Association for the Abolition of Abbreviations and Acronyms
Miscellaneous » Funnies

AAAAAAmicale Athoise des Amateurs d'Automobiles Anciennes (French: Ath Friendly Lovers of Vintage Cars; Ath, Belgium)
Miscellaneous

AAAAAAssociation Amicale des Amateurs d'Andouillettes Authentiques (used to qualify an andouillette, French cooked pork meat)
Miscellaneous

AAAAAAssociation of Absolute Apologists Alfons Alle
Miscellaneous » Funnies

AAAAAAnderson African American Alumni Association
Regional » African