Abbreviations beginning with a

ACTAssociation of Christian Truckers
Miscellaneous » Automotive

ACTAssociation of Civilian Technicians
Miscellaneous

ACTAssociation of Cleaning Technicians (NJ, NY, PA, CT, MD, VA)
Miscellaneous

ACTAssociation of Commercial Television in Europe (Brussels, Belgium)
Miscellaneous

ACTAssociation of Consumers and Taxpayers (New Zealand political party)
Miscellaneous

ACTAssociation pour l'Amélioration des Conditions de Travail (French: Association for the Improvement of Working Conditions)
Miscellaneous

ACTAsynchronous Control Transfer
Miscellaneous

ACTAtacama Cosmology Telescope
Miscellaneous » Unclassified

ACTAtmospheric Chemical-Transport
Miscellaneous

ACTAtmospheric Corrosion Testing
Miscellaneous

ACTAt-Risk Adult Crime Tactics (training program)
Miscellaneous

ACTAttack Cycle Timeline (timed events required to attack a target)
Miscellaneous

ACTAttitude Control Thrusters
Miscellaneous

ACTAugmented Catalytic Thruster
Miscellaneous

ACTAustralian Capital Territory (Australian state/territory)
Miscellaneous

ACTAutism Care and Treatment
Miscellaneous » Unclassified

ACTAuto Club Turkey
Miscellaneous

ACTAutomated Confirmation Transaction Service (NASD)
Miscellaneous