Your abbreviation search returned 142 meanings
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| Rank Abbr. | Meaning | |
|---|---|---|
| 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) | |
| A/O | At Once | |
| 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) | |
| A/O | As Of | |
| 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 | |
| A/O | Analog Output | |
| 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) | |
| A/O | Area of Operations | |
| 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) | |
| A/O | Alert and Oriented (charting a patient's mental status) | |
| AO | American Outfitters (store) | |
| AO | Automated Office | |
| AO | Alpha et Omega (epigraphy) | |
| AO | Auxiliary Oiler (Ship Type) | |
| AO | Advanced Organization (Church of Scientology) | |
| AO | Access Opening | |
| 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 | Assembly Order | |
| AO | Abnormal Occurrence | |
| AO | Aviation Ordnance Person (US DoD) | |
| AO | Atelosteogenesis | |
| A/O | Acoustic/Optic (spectroscopy) | |
| 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 | |
| A/O | Accounting Only | |
| 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 | Associate Post Office (also called associate office) | |
| AO | Association Orukutuku | |
| AO | Awards and Obligations | |
| AO | Aeronautical Orders (orders authorizing a military person to perform duties in flight) | |
| AO | Aerosol Obscurant | |
| AO | ACCS (Army Command and Control System) OSI (Operator System Interface) | |
| AO | Accompanying Object | |
| AO | Air Overseas, Inc. | |
| AO | Arkansas and Ozarks Railway | |
| AO | Approximate Optimum Method | |
| AO | (USN Rating) Aviation Ordnanceman | |
| AO | Authorized Outage | |
| AO | Adaptive Onestep (IEEE) | |
| A/O | Atomic Weight Percent | |
| AO | Agreement Officer (US AID) | |
Note: We have 60 other definitions for A/O in our Acronym Attic