| Acronym | Definition |
|---|
| AO➣Announcement of Opportunity |
| AO➣All Out |
| AO➣Anarchy Online (internet game) |
| AO➣Angola |
| AO➣Adaptive Optics |
| AO➣Adjustable Objective (rifle telescopic sight) |
| AO➣Order of Australia |
| AO➣Australian Open (tennis tournament) |
| AO➣Adults Only (ESRB game rating, 18 yrs. and up; graphic sex/violence) |
| AO➣Administrative Order |
| AO➣Account Of |
| AO➣Advisory Opinion |
| AO➣Aosta (Val d'Aosta, Italy) |
| AO➣And Others |
| AO➣Anarchy-Online (PC MMORPG) |
| AO➣Among Others |
| AO➣Agent Orange (herbicidal warfare) |
| AO➣Analog Output |
| AO➣Other Articles (US postal service) |
| AO➣Applied Optics |
| AO➣Officer of the Order of Australia |
| AO➣Annoying Orange (Youtube channel) |
| AO➣Ambient Occlusion (graphics) |
| AO➣Atlantic Ocean |
| AO➣Assessing Officer (tax; India) |
| AO➣American Optical |
| AO➣Adults Only |
| AO➣Abgabenordnung (German tax regulations) |
| AO➣Abdominal Obesity |
| AO➣Arctic Ocean |
| AO➣Age Old |
| AO➣Arctic Oscillation |
| AO➣Atmosphere-Ocean |
| AO➣Assessment Objective |
| AO➣Area of Operation |
| AO➣Application Outsourcing |
| AO➣Area Office |
| AO➣Archives of Ontario |
| AO➣Australian Airlines (IATA airline code) |
| AO➣Audit Office |
| AO➣Anti-Oxidant |
| AO➣Acridine Orange |
| AO➣AntiOnline (computer security website) |
| AO➣Abort Output (TELNET protocol) |
| AO➣Argentum Online |
| AO➣Authorizing Official (for IMPAC Purchases) |
| AO➣Arbeitsgemeinschaft für Osteosynthesefragen (Association for the Study of Internal Fixation) |
| AO➣Action Oriented |
| AO➣Alexander Ovechkin (hockey player) |
| AO➣Autonomous Okrug |
| AO➣Administration Officer |
| AO➣Atomic Oxygen |
| AO➣Admit One |
| AO➣Action Officer |
| AO➣Academy of Osseointegration |
| AO➣Application Object |
| AO➣Autres Objets (Canada universal postal union) |
| AO➣American Outlaws (soccer fan group) |
| AO➣Aircraft Operator |
| AO➣Ambleside Online (homeschool curriculum) |
| AO➣Atomic Orbital |
| AO➣Operational Availability |
| AO➣Amphibious Operation |
| AO➣Accounts Office |
| AO➣Atlas Orthogonal (chiropractic technique; also seen as AOT) |
| AO➣Aviation Officer |
| AO➣Anglicans Online |
| AO➣Afrique Orientale (German East Africa) |
| AO➣Active Optical |
| AO➣Account Owner |
| AO➣Air Officer |
| AO➣Air Operation |
| AO➣Appeals Office(r) |
| AO➣Auslandsorganisation (foreign section of NSdAP) |
| AO➣Office of the Administrator |
| AO➣Acousto Optics |
| AO➣Aerial Observer |
| AO➣Answers Only (educational testing) |
| AO➣Atlanto-Occipital (joint) |
| AO➣American Outfitters (store) |
| AO➣Automated Office |
| AO➣Alpha et Omega (epigraphy) |
| AO➣Auxiliary Oiler (Ship Type) |
| AO➣Access Opening |
| AO➣Advanced Organization (Church of Scientology) |
| AO➣Fly Outs (baseball statistic) |
| AO➣Automated Operations |
| AO➣Ambulance Officer (ambulance service; chiefly Australian) |
| AO➣Air Observer |
| AO➣Atualidades Ornitológicas (Ivaiporã-PR, Brazil) |
| AO➣Acquisition Objective |
| AO➣Associated Object |
| AO➣Atomic Operation |
| AO➣Aaron Owens (streetball player) |
| AO➣Annotated Outline |
| AO➣Athlitikos Omilos (Greek: Athletic Club) |
| AO➣Assignment Officer |
| AO➣Asylum Officer (US DHS) |
| AO➣Associate Office |
| AO➣Abnormal Occurrence |
| AO➣Assembly Order |
| AO➣Aviation Ordnance Person (US DoD) |
| AO➣Atelosteogenesis |
| AO➣Accredited Organization |
| AO➣Assisted Opener (type of knife) |
| AO➣Authentic Orginal (retail) |
| AO➣Attendees Only |
| AO➣Accommodation Officer |
| AO➣Access Ordering |
| AO➣Auxiliary Operator (nuclear industry) |
| AO➣Anodal Opening |
| AO➣Automags Online |
| AO➣Attack Objective |
| AO➣Assisted Operations |
| AO➣Acronym Overload |
| AO➣Aortagram |
| AO➣Apostolic Oblates |
| AO➣Asia Onlus (Rome, Italy) |
| AO➣Airdrome Officer |
| AO➣Administrative Office/ Officer |
| AO➣Association Orukutuku |
| AO➣Associate Post Office (also called associate office) |
| AO➣Aeronautical Orders (orders authorizing a military person to perform duties in flight) |
| AO➣Awards and Obligations |
| AO➣ACCS (Army Command and Control System) OSI (Operator System Interface) |
| AO➣Aerosol Obscurant |
| AO➣Accompanying Object |
| AO➣Approximate Optimum Method |
| AO➣Arkansas and Ozarks Railway |
| AO➣Air Overseas, Inc. |
| AO➣(USN Rating) Aviation Ordnanceman |
| AO➣Authorized Outage |
| AO➣Adaptive Onestep (IEEE) |