What does AO stand for?

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Rank	Abbr.	Meaning
******	AO	Announcement of Opportunity
******	AO	Anarchy Online (internet game)
******	AO	Angola
******	AO	Adaptive Optics
******	AO	Adjustable Objective (rifle telescopic sight)
******	AO	Order of Australia
******	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	Atlantic Ocean
******	AO	American Optical
******	AO	Adults Only
******	AO	Abgabenordnung (German tax regulations)
*****	AO	Arctic Ocean
*****	AO	Age Old
*****	AO	Arctic Oscillation
*****	AO	Atmosphere-Ocean
*****	AO	Area of Operation
*****	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	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	Atelosteogenesis
***	AO	Accredited Organization
***	AO	Assisted Opener (type of knife)
***	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	aviation ordnance person (US DoD)
**	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)
*	AO	All Out
Note: We have 65 other definitions for AO in our Acronym Attic

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