OAS could mean any of these things: Organization of American States Oracle Application Server Option Adjusted Spread Organisation Armée Secrète Oral Allergy Syndrome Optical Answer Sheet Office of Applied Studies (SAMHSA) Office of the Assistant Secretary Old Age Security Act (Canada) Office of Administrative Services Office of Aircraft Services Online Auction Site Office Automation System Offensive Air Support Organization of Agreement States Online Account Services Offensive Avionics System Ophthalmic Anesthesia Society Office of Aerospace Studies 2'-5' oligoadenylate synthetase Organizational Assessment Survey Open Airways for Schools On Another Subject Organization of African States Oman Aviation Services Obstacle Avoidance Sonar Owner Activity Statement Optical Access Switch (Quantum) Obstacle Avoidance System Oceanic Automation System Onizuka Air Station (USAF) Omnidirectional Airspeed Sensor Optical Automation Systems (Continuum Photonics) Optically Activated Semiconductor Optical Amplifier Section Operations Automation System Originating AT&T Switch Orbiter Attachment System Operation After Suspension Operator Administration System (Bellcore) The A.P.E.C. you're think of probably is the Asia-Pacific Economic Cooperation. Others are... Alliance for the Preservation of English in Canada Asia-Pacific Economic Cooperation Applied Power Electronics Conference Atlantic Provinces Economic Council (Canada) Asia Pacific Economic Conference Avian Pathogenic Escherichia Coli Acquisition Planning Executive Council Association for the Preservation of English in Canada Aircrew Protection Executive Committee Asian-Pacific Employees Committee Access, Process, Employ, and Collaborate (intelligence community) Aircrew Protection Executive Council (USAF) http://acronymfinder.com