What does addtl stand for?

additional

This definition appears very rarely

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Aviation Digital Data Service Attention Deficit Disorder Support Association (Canada) Army Data Distribution System Interface Access to Distributed Databases for Statistical Information and Analysis Application-Specific Digital Signal Processor Advanced Data Driven Testing (online testing) Alternate Day L-Dopa Therapy (neurology) Automatic Data Distribution Tool Alzheimer's Disease Diagnostic and Treatment Centers Alzheimer's Disease Diagnostic and Treatment Centers		Add Traffic Specification Additional Duty Air Data Display Unit (avionics) Albany-Dougherty Drug Unit (Georgia) Alcoholism and Drug Dependence Unit (Mayo Medical Center; Rochester, MN) Ateneo de Davao University AddVise Inredning Skyddsventilation AB (Swedish: Addvise Interior Protective Ventilation AB; Bromma, Sweden) Add Volume (disk drives) Alpacas of Dun-Dor Woods (Arkville, NY) Anterior Disc Displacement Without Reduction