Abbreviations beginning with a

ACAABAssociate Certified Applied Animal Behaviorists
Miscellaneous » Animals

ACAAIAir Cargo Agents Association of India (Mumbai, Maharashtra, India)
Academic & Science

ACAAIAmerican College of Allergy, Asthma & Immunology
Academic & Science » Societies

ACAAIAmerican College of Allergy, Asthma and Immunology
Business » Professional Organizations

ACAAPAir Cargo Agents Association of Pakistan
Academic & Science

ACABAll Cops Are Bastard
Community » Media

ACABAssociation of Community Access Broadcasters
Community

ACABAir Cavalry Attack Brigade
Governmental » Military

ACABAll Cats Are Beautiful
Internet

ACABAlways Carry A Bible
Internet

ACABAdvisory Committee on Agricultural Biotechnology (USDA)
Miscellaneous

ACABAlaska Contemporary Art Bank (est. 1975; Alaska State Council on the Arts; Alaska Department of Education and Early Development)
Miscellaneous

ACABAll Colors Are Beautiful
Miscellaneous

ACABAll Communists Are Bastards
Miscellaneous » Unclassified

ACABAll Coppers Are Bastards (common British tattoo)
Miscellaneous

ACABAlways Carry A Bible (often a tattoo)
Miscellaneous