Abbreviations beginning with a

ARCAAutomobile Racing Club of America
Miscellaneous » Automotive

ARCAAustralian Retail Credit Association
Regional » Australian

ARCAAmateur racers crashers association
Sports » Racing

ARCAAutomobile Race Car Association
Sports » Racing

ARCAAutomobile Racing Club of America
Sports » Racing

ARCACAnnapolis Region Community Arts Council (Canada)
Miscellaneous

ARCADAssociation of Renault and Chrysler for Automotive Distribution
Miscellaneous » Automotive

ARCADAAbilene Regional Council on Alcohol and Drug Abuse
Governmental » Council

ARCADAAbilene Regional Council on Alcohol and Drug Abuse
Miscellaneous » Unclassified

ARCADEAdvancing Relationships Character Aspirations Drives Excellence
Community

ARCADEAbsolute Radiometer for Cosmology Astrophysics and Diffuse Emission
Governmental » NASA

ARCADEAutomatized Reading Comprehension And Diagnostic Evaluation
Miscellaneous » Unclassified

ARCADYAssessment of Roundabout Capacity and Delay
Miscellaneous » Automotive

ARCALAircraft Radio Control Of Aerodrome Lighting
Miscellaneous » Aircraft & Aviation

ARCAMARCAM, company name, was founded by me, from ARC, in arc-welding and CAM in Computer Aided Manufacturing.
Computing

ARCAMLegislative Assembly of Cameroon
Computing » Assembly

ARCAMArmy Reserve Components Achievement Medal
Governmental » Military