| Acronym | Definition |
|---|
| AD | Adult |
| AD | Administration |
| AD | Advertisement |
| AD | Adapted |
| AD | Anno Domini (Latin: In the Year of Our Lord; referring to the Gregorian calendar system) |
| AD | Archduke |
| AD | Alternate Days |
| AD | Art Director |
| AD | American Dream |
| AD | Active Directory |
| AD | After Death |
| AD | Application Data |
| AD | Application Development (IBM) |
| AD | Assembly District |
| AD | Assistant Director |
| AD | Athletic Director |
| AD | Active Duty |
| AD | American Dad (TV show) |
| AD | Associate Director |
| AD | Air Defense |
| AD | Advanced Design |
| AD | Application Developer |
| AD | Andes |
| AD | Activity Director |
| AD | Analog-to-Digital |
| AD | Associate Degree |
| AD | Accidental Death (life insurance) |
| AD | Army Depot |
| AD | Authorized Dealer |
| AD | Architectural Design |
| AD | Admiral |
| AD | Authorized Distributor |
| AD | Andorra (top-level domain) |
| AD | Amministratore Delegato (Italian management designation) |
| AD | Amazing Designs (embroidery software) |
| AD | Arrested Development (rap group) |
| AD | Arrested Development (TV show) |
| AD | Alzheimer's Disease |
| AD | Address Data |
| AD | Adrian Peterson (Oklahoma Sooners football player) |
| AD | Access Denied |
| AD | Administrative Domain |
| AD | Analog Devices, Inc. |
| AD | Alcohol Dependence |
| AD | Audio Description (cinema accessibility) |
| AD | Anti-Dumping |
| AD | Agency Development (various organizations) |
| AD | Right Ear |
| AD | Application Directory |
| AD | Aggregate Demand (economics) |
| AD | Appellate Division |
| AD | Antidepressant |
| AD | Armored Division |
| AD | Addendum |
| AD | Adopted Daughter |
| AD | Anaheim Ducks (hockey) |
| AD | Airworthiness Directive |
| AD | Agnus Dei |
| AD | Adoptee |
| AD | Anaerobic Digestion |
| AD | Atopic Dermatitis |
| AD | Advanced Development |
| AD | Air Division |
| AD | Adjoint (mathematics; group theory) |
| AD | Antidumping Duty |
| AD | Automated Data |
| AD | Air Dried (timber) |
| AD | Airdrop |
| AD | Azumanga Daioh (anime) |
| AD | Automatic Distribution (US DoD) |
| AD | Anchorage-Dependent (cells) |
| AD | Aerodrome |
| AD | Addison's Disease |
| AD | Autosomal Dominant (genetics; dominant gene on one of the 23 pairs of autosomes) |
| AD | Accrued Depreciation (finance) |
| AD | Algemeen Dagblad |
| AD | Alien Dice (webcomic) |
| AD | Accumulated Depreciation (accounting) |
| AD | Adaptive Control (welding) |
| AD | Accidental Damage |
| AD | As Drawn |
| AD | After Date |
| AD | Altium Designer |
| AD | Administratively Determined |
| AD | An der Donau (German:on the Danube) |
| AD | Alexis Denisof (actor) |
| AD | Albus Dumbledore (Harry Potter) |
| AD | Archival Disc (disc storage) |
| AD | Alliance for Democracy (Nigeria) |
| AD | After Deployment |
| AD | Accidental Discharge |
| AD | Area Defense |
| AD | Ante Diem |
| AD | Auto Disable (syringe) |
| AD | Asperger's Disorder |
| AD | Acción Democrática (Democratic Action Party) |
| AD | Academic Decathlon |
| AD | Destroyer Tender (US Navy ship designation) |
| AD | Australian Democrats (political group) |
| AD | Priority Add-On (US DoD) |
| AD | Accastillage Diffusion (French: Distribution Fitting) |
| AD | Approved Document (UK) |
| AD | Areal Density |
| AD | Aircraft Division (USN) |
| AD | Autodistribution (French automotive parts distributor) |
| AD | Automatic Differentiation |
| AD | Agility Dog (canine agility title) |
| AD | Audio Drama |
| AD | Aviation Division |
| AD | Annuity Due |
| AD | Atmospheric Deposition |
| AD | Awdal (postal region, Somalia) |
| AD | Adellion (game) |
| AD | Activation/Deactivation |
| AD | Assembly Drawings (Nortel) |
| AD | Antonio Davis |
| AD | Advance Design |
| AD | Anti-Diarrheal |
| AD | Animal Development (genetics) |
| AD | Advance Development |
| AD | Average Deviation |
| AD | Aperture Door |
| AD | Absolute Deviation |
| AD | Attitude Determination |
| AD | Attention Danger (gaming clan) |
| AD | Advo, Inc (stock ticker symbol) |
| AD | Active Delivery |
| AD | Assistant Driller |
| AD | Administrative Distance (routing information source rating) |
| AD | Assignment Date |
| AD | Alarm Data (Alcatel) |
| AD | Activating Domain |
| AD | Acquisition and Divestiture |
| AD | Azure Dreams (role-playing game) |
| AD | Ace Deuce (band) |
| AD | Applicable Document |
| AD | Adaptive Development |
| AD | Associated Document |
| AD | Adoptive Dad |
| AD | Affinity Diagram (Sprint - Quality) |
| AD | Aviation Machinist Mate (US Navy rating) |
| AD | Außer Dienst (German: Retired) |
| AD | Acronym Dictionary |
| AD | Autograph Document |
| AD | Andrew Dick (manuscript surcharge mark, British East Africa) |
| AD | Aberforth Dumbledore (Harry Potter character) |
| AD | Aid to the Disabled |
| AD | autodestruct (syringe) |
| AD | Attack Director |
| AD | Autonomous Domain |
| AD | After Divestiture |
| AD | Amplitude Distortion |
| AD | Autogenic Drainage (respiratory physiology) |
| AD | Amigos de Dios (Guatemala church support group) |
| AD | Auricula Derecha (Spanish: Right Atrium) |
| AD | Archive Device |
| AD | Ancillary Device |
| AD | Activity Driver |
| AD | Addendum Document (to an OSI Standard; ISO) |
| AD | Acquisition Directorate |
| AD | Alternativa Demokratika/Alliance for Social Justice (Malta) |
| AD | Academic Don |
| AD | After Dianetics (L. Ron Hubbard) |
| AD | Affiliate Defined |
| AD | Approved Direction |
| AD | Armament Division |
| AD | Analysis of Dispersion |
| AD | Accession Document |
| AD | Acknowledgement Due (postal) |
| AD | Automatic Damper |
| AD | Airspace Deconfliction |
| AD | alt.digitiser (newsgroup) |
| AD | Allocation Descriptor (OSTA universal disk format) |
| AD | Air Directive |
| AD | Attila Dogan Company |
| AD | Authorized Delay |
| AD | Alternating Direct |
| AD | Activity Discard (ITU-T) |
| AD | Akabane Disease |
| AD | Alcohol Deprived |
| AD | Antimatter Decelerator |
| AD | Acoustic Densitometry (ultrasound) |
| AD | Artificial Dumbness |
| AD | Partia Aleanca Demokratike (Party of the Democratic Alliance, Albania, aka: PADSh) |
| AD | Auxiliary Drain |
| AD | Adjunct Detector (US DoD) |
| AD | Automatic Depressurization |
| AD | Add Delegations (security permissions) |
| AD | Advanced Deployability |
| AD | Accumulator Dehydrator (automotive A/C component) |
| AD | Alternating Directly |
| AD | Antidisturbance |
| AD | Acoustic Deficiency |
| AD | Aperture Card Diazo |
| AD | Awaiting Disconnection |
| AD | Anderson-Darling Statistical Test |
| AD | Auxiliary Destroyer Tender |
| AD | Antodromic |
| AD | Acquisition Doppler |
| AD | Alarco - Dogus |