What does O.A.S and A.P.E.C mean?

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