| Acronym | Definition |
|---|
| AA | American Airlines |
| AA | Alcoholics Anonymous |
| AA | Anti-Aircraft |
| AA | Associate in Arts (degree) |
| AA | Battery Size |
| AA | USDA Grade for Dairy Products and Eggs |
| AA | Aruba |
| AA | Ana (Greek: the same amount each) |
| AA | Amino Acid |
| AA | African-American |
| AA | All-American |
| AA | Armed Forces Americas |
| AA | American Association (AAA baseball league) |
| AA | Ann Arbor (Michigan) |
| AA | Administrative Assistant |
| AA | Automobile Association (England) |
| AA | As Above |
| AA | Affirmative Action |
| AA | Asian American |
| AA | Anti-Aliasing |
| AA | Action-Adventure (movie genre) |
| AA | Alcohol Abuse |
| AA | America's Army (US Army computer game) |
| AA | Asset Allocation |
| AA | Athletic Association |
| AA | Appropriate Action |
| AA | Alumni Association |
| AA | Austrian Airlines |
| AA | Academy Award(s) |
| AA | Atomic Absorption |
| AA | Acetic Acid |
| AA | Arachidonic Acid |
| AA | Anne Arundel (Maryland county) |
| AA | Advertising Agency |
| AA | Acronym Attic |
| AA | Bra Size |
| AA | Administrative Associate |
| AA | All Aboard (IBM model railroad interface) |
| AA | Alto Adige (Italian region) |
| AA | Auswärtiges Amt (Exterior Office) |
| AA | All After |
| AA | Ansel Adams (photographer) |
| AA | Auto Assault |
| AA | Aggravated Assault |
| AA | Associative Arrays (PERL programming) |
| AA | Alaska-Anchorage (University of Alaska Anchorage) |
| AA | Asian Avenue (website) |
| AA | Air-to-Air |
| AA | Alzheimer's Association |
| AA | Architectural Association (London, England) |
| AA | Axis & Allies (game) |
| AA | Alopecia Areata |
| AA | Air Assault |
| AA | Anaheim Angels (major league baseball team) |
| AA | Attribute Authority |
| AA | Addicts Anonymous |
| AA | Arthur Andersen (consulting firm) |
| AA | Affected Area |
| AA | Abdominal Aorta |
| AA | Assistant Administrator |
| AA | Allergic Asthma |
| AA | Amon Amarth (band) |
| AA | Attendance Allowance (UK housing subsidy) |
| AA | Aluminum Association |
| AA | Air Ambulance |
| AA | Anonymous Access (3GPP) |
| AA | Associate Administrator |
| AA | Appropriate Authority |
| AA | Adjustment Assistance |
| AA | Appointing Authority |
| AA | Asian-African |
| AA | Accumulated Amortization (accounting) |
| AA | Authoritative Answer (DNS) |
| AA | Angels & Airwaves (band) |
| AA | Acrylic Acid |
| AA | Attitude Adjustment (Alcoholics Anonymous) |
| AA | Alleged Assault |
| AA | Acts of the Apostles (bible) |
| AA | Attack Attack! (band) |
| AA | Ao Ano (Per Year; Brazil) |
| AA | Anxiety Attack |
| AA | Acetic Anhydride |
| AA | Administrative Authority |
| AA | Angle of Attack |
| AA | Anonyma Alkoholister (Sweden) |
| AA | Access Authorization |
| AA | Animal Aid |
| AA | Australian Army |
| AA | AUSCERT Advisory (Australian Computer Emergency Response Team) |
| AA | Administrative Assistance (Congress) |
| AA | Agent Aika (anime character) |
| AA | Analysis and Applications (mathematics) |
| AA | Adverse Action |
| AA | Audio Adrenaline (band) |
| AA | Action Aid (UK) |
| AA | Assembly Area |
| AA | Alcoa Aluminum (stock symbol) |
| AA | American Aviation |
| AA | American Atheists, Inc. |
| AA | Active Application |
| AA | Activation Analysis |
| AA | Advertising Association |
| AA | Arithmetic Average |
| AA | American Anthropologist (organization/newsletter) |
| AA | Arnold Arboretum (Harvard University) |
| AA | Automated Attendant |
| AA | Ad Acta |
| AA | Ansett Airways (Australia) |
| AA | Active Army |
| AA | Approving Authority |
| AA | Anti-Armor (US DoD) |
| AA | Albuquerque Academy (New Mexico) |
| AA | Acute Abdomen |
| AA | Anonyme Alkoholikere (Alcoholics Anonymous) |
| AA | Anders And |
| AA | Assistance Administration |
| AA | Acquisition Activities |
| AA | Anadolu Ajansi (Turkish News Agency) |
| AA | Alternate Assessment |
| AA | Andecha Astur (Asturian Nationalist Party) |
| AA | Auto Aim (gaming) |
| AA | Activity Area |
| AA | Application Activity |
| AA | Amy Acker (actress) |
| AA | Account Administrator |
| AA | Analysis of Alternatives |
| AA | Attainment Area (EPA) |
| AA | Aromatic Amine (chemical for industrial crop production) |
| AA | Aku Ankka (Finnish: Donald Duck) |
| AA | Atlanto-Axial (joint) |
| AA | Administering Agency (DOL) |
| AA | Aberdeen Area (Maryland) |
| AA | Average Audience |
| AA | Academic Administrator |
| AA | alcohol-preferring |
| AA | American Antiquity (publication) |
| AA | Agent Agreement |
| AA | Attack Assessment |
| AA | Air Army |
| AA | Arboricultural Association (Hampshire, England) |
| AA | Athletics Australia |
| AA | Alveolar-Arterial |
| AA | Application Administrator |
| AA | Arn Anderson (pro wrestler) |
| AA | Adios Amigo |
| AA | Autoanswer |
| AA | Avenue of Approach |
| AA | Aviation Archive (publication) |
| AA | Absent All (day; attendance record) |
| AA | Accreditation Authority |
| AA | Acupuncture Analgesia |
| AA | Aminoacetone |
| AA | Air Armament |
| AA | Acting Appointment |
| AA | Associate in Accounting |
| AA | Advanced Airway |
| AA | American Anthropology (scientific group) |
| AA | Always Afloat (shipping) |
| AA | Amount Administered |
| AA | Area of Action |
| AA | Austere Academy (Lemony Snicket) |
| AA | Antiquities Authority |
| AA | Avro Arrow (aviation) |
| AA | Automatic Answer |
| AA | Alternate Advancement (EverQuest gaming) |
| AA | Approval Action |
| AA | Axis of Advance |
| AA | Adaptive Array |
| AA | Aerolineas Argentina |
| AA | Administrative Arrangement |
| AA | Accounting Authority (INMARSAT) |
| AA | Assistant Administration |
| AA | Aldosterone Antagonist |
| AA | Authorized Absence |
| AA | Absolute Altitude |
| AA | Arithmetical Average |
| AA | Air Attache |
| AA | All Advantage |
| AA | Absolute Abstinence (Alcoholics Anonymous) |
| AA | Applied Aerodynamics (course) |
| AA | Adult Adoptee (adoptions) |
| AA | Application Association |
| AA | Automatic Approach |
| AA | Ablative Absolute |
| AA | Aspect Angle (aviation) |
| AA | Avian Adventures (bird products) |
| AA | Anatomical Adaptation |
| AA | Acronym Abuse |
| AA | Author's Alteration |
| AA | Assignment Area (Census) |
| AA | Ancient Adena (Lineage 2 game) |
| AA | Advanced Academy |
| AA | Anchor Assembly |
| AA | Alzheimer's Australia |
| AA | Achievement Age |
| AA | Allah Akhbar (Arabic: God is Great) |
| AA | Airman Apprentice (USN paygrade E-2) |
| AA | Archery Australia |
| AA | Advancement Act of 1995 |
| AA | Approximate Absolute (temperature scale) |
| AA | Achieved Availability |
| AA | Arithmetic Accuracy |
| AA | Amplitude of Accommodation (ophthalmology) |
| AA | Amstrad Action (Amstrad CPC magazine) |
| AA | Acquisition Agent |
| AA | Affordability Analysis |
| AA | Abort Accept (ITU-T) |
| AA | Authorized Allowance |
| AA | Aptitude Area |
| AA | Automated Auction |
| AA | Amiga Anywhere |
| AA | Airborne Alert |
| AA | Analog-to-Analog |
| AA | Arrival Angle |
| AA | Adult Accompaniment (film ratings) |
| AA | Approved Apparatus |
| AA | Audit Agent |
| AA | Ahavath Achim (Synagogue) |
| AA | Anesthesiologist's Assistant |
| AA | Academy of Aphasia |
| AA | Advices of Allowance |
| AA | Accountable Area |
| AA | Algorithmic Architecture |
| AA | Acadia Axemen (Acadia Junior High School) |
| AA | Abbreviated Analysis |
| AA | Ape Alliance |
| AA | Atrophia Areata |
| AA | Anderson Analytics, LLC |
| AA | Argentum Astrum (Aleister Crowley's Mystical Fraternity) |
| AA | assessment agent |
| AA | Airfield Assault |
| AA | Active-Assistive |
| AA | Affordability Assessment |
| AA | Agility Addicts (UK dog agility club) |
| AA | Arsenal do Alfeite (Portuguese: Arsenal of Alfeite) |
| AA | Applicant Assistance (DHS/FEMA) |
| AA | Automatic Adjust |
| AA | Advanced Alloy |
| AA | Alter Aeon (online role playing game) |
| AA | Accountable Activity (US DoD) |
| AA | Antiochian Archdiocese (United States Eastern Orthodox Church subordinate to the Patriarch of Antioch) |
| AA | Advantage Agreement (SprintPCS contract) |
| AA | Alert Areas |
| AA | Active Adjunct (Sonar) |
| AA | Austrian Alliance (gaming clan) |
| AA | Associazione Allievi (Allievi Association, Italy) |
| AA | Amarillo Area Office (US DoE) |
| AA | Angle Angle Similarity Postulate (geometry) |
| AA | Accredited in Accountancy |
| AA | Air Advisor |
| AA | Axillary Arch (area near the shoulder) |
| AA | Ann Arbor Railroad Company (Michigan) |
| AA | Ambulance Assistant (emergency services) |
| AA | Advanced Agreement |
| AA | Amigos en Acción (Spanish) |
| AA | Académie d'Alsace |
| AA | Amazing Assist (golf swing trainer) |
| AA | Adam's Army |
| AA | Annulus Air |
| AA | Allied Affairs |
| AA | Armature Accelerator |
| AA | Alt Advancement (gaming rank promotion) |
| AA | Aiming Algorithm |
| AA | Automatic Associator |
| AA | Accelerated Academics |
| AA | Alerting Authority |
| AA | Anal Aneurysm |
| AA | Attenuation Adaptivity |
| AA | Advise of Allotment |
| AA | Anarchists of America |
| AA | Stock and Bond Rating |
| AA | American Annex |
| AA | Armies in the Atlantic (used with APO/FPO) |
| AA | Augustinians of the Assumption, Assumptionists (religious) |
| AA | Audits and Assessment Office |
| AA | ANDVT Airterm (US DoD; ANDVT = Advanced Narrowband Digital Voice Terminal) |
| AA | Asesoría Automotriz (Guatemala car dealership) |
| AA | Alternate/Alternative Analysis |
| AA | Intermediate Level of League (minor league baseball) |
| AA | Arlington Annex Building (Virginia) |
| AA | Second Highest Level of Division I College Athletics (United States) |
| AA | Agjencia e Akreditimit (Accredition Agency, Albania) |
| AA | Akbar and Aleem Associates Planners & Consulting Engineers (Pakistan) |
| AA | Absorption Développement Atomique (French: atomic absorption) |
| AA | Agglutination Anticyclonique |
| AA | No sickle-cell Anemia (allele rendering; no sickling gene) |