| A&D | Admission and Disposition (report) 
| Others |
| A&D | Aerospace and Defence
| Others |
| A&D | Aerospace and Defense
| Others |
| A&D | Alcohol and Drugs
| Others |
| A&D | Auto and Design
| Others |
| A.D | Analogue to Digital
| Others |
| A.D. | Christian era (anno Domini [Lat.])
| Others |
| a.d. | right ear (Latin auris dexter)
| Others |
| A/D | Active Duty
| Others |
| A/D | AeroDrome
| Others |
| A/D | Analog / Digital
| Others |
| A/D | Analog-to-Digital
| Others |
| A/D | Analog-to-Digital converter
| Others |
| A/D | Analog/Digital
| Others |
| AD | A Ad
| Others |
| AD | A Dato (from date)
| Others |
| AD | A2 AD
| Others |
| AD | Aadhar Card
| Others |
| AD | Abdominal Diameter
| Others |
| AD | Abdominal Diaphragmatic breathing
| Others |
| AD | Abdominal Discomfort
| Others |
| AD | About to Depart
| Others |
| AD | Above Diaphragm
| Others |
| AD | Abu Dhabi
| Others |
| AD | Academic Director
| Others |
| AD | Accelerated Depreciation
| Others |
| AD | Accelerator Delta
| Others |
| AD | Accident Dispensary
| Others |
| AD | Accidental Death
| Others |
| AD | Acción Democrática
| Others |
| AD | Accumulated Depreciation
| Others |
| AD | Accumulation Distribution
| Others |
| AD | Acetabular Depth
| Others |
| AD | Acid Detecting
| Others |
| AD | Acknowledgement of Debt
| Others |
| AD | Acronym Dictionary
| Others |
| AD | Acronym Director
| Others |
| AD | Action Due
| Others |
| AD | Active Device
| Others |
| AD | Active Directory
| Software |
| AD | Active Disease
| Others |
| AD | Activity Director
| Others |
| AD | Acute Dermatomyositis
| Others |
| AD | Acute Diarrhoea
| Others |
| AD | Acute Disorder
| Others |
| AD | Acute Dissection
| Others |
| AD | Acute Dysentery
| Others |
| AD | Adaptive Dither
| Others |
| AD | ADd-On
| Others |
| AD | addict
| Others |
| AD | Addictive Disorder
| Others |
| AD | Additional Delivery
| Others |
| AD | adductor
| Others |
| AD | Adenosine Deaminase
| Others |
| AD | ADenovirus
| Others |
| AD | Adjustment Disorder
| Others |
| AD | Adjuvant Disease
| Others |
| AD | Administrative Domain
| Others |
| AD | Adminstritiv Distance
| Others |
| AD | Admission and Discharge
| Others |
| AD | Admissions
| Others |
| AD | Admitting Diagnosis
| Others |
| AD | Adult AD
| Others |
| AD | Adult Disease
| Others |
| AD | Advance Directive
| Others |
| AD | Advanced Deployability
| Others |
| AD | Advanced Development
| Others |
| AD | Advanced Durability
| Others |
| AD | Advantage
| Others |
| Ad | Advertisement
| Advertising |
| AD | Advertising Director
| Others |
| AD | Affective Disorder
| Others |
| AD | After a Date
| Others |
| AD | After Daniel
| Others |
| AD | After Dark
| Others |
| AD | After Death
| Others |
| AD | After Democracy
| Others |
| AD | After Dinner
| Others |
| AD | After Discharge
| Others |
| AD | After the Downfall
| Others |
| AD | AfterDark Screensaver
| Others |
| AD | Aggregate Demand
| Others |
| AD | Agility Dog
| Others |
| AD | Air Defense
| Others |
| AD | Air Density
| Others |
| AD | Air Diffusion
| Others |
| AD | Air Division
| Others |
| AD | Air Dried
| Others |
| AD | Airworthiness Directive
| Others |
| AD | Alcohol Dehydrogenase
| Others |
| AD | Alcohol Dependence
| Others |
| AD | Alcohol Dependent
| Others |
| AD | Alfred Daniel
| Others |
| AD | All Day
| Others |
| AD | All Done
| Others |
| AD | Allergic Disease
| Others |
| AD | Alliance of Destructors
| Others |
| AD | Allowable Deductions
| Others |
| AD | Almost Dead
| Others |
| AD | Alternating Days
| Others |
| AD | Alveolar Duct
| Others |
| AD | Always Demanding
| Others |
| AD | Always Dependable
| Others |
| AD | Alzheimer's Disease
| Others |
| AD | Alzhemier's Disease
| Others |
| AD | AMD Corporation
| Others |
| AD | American Dog
| Others |
| AD | Amici Dignitatis
| Others |
| AD | amiodarone
| Others |
| AD | Amoebic Dysentery
| Others |
| AD | Anaerobic Digestion
| Others |
| AD | Analgesic Dose
| Others |
| AD | Analog Disc
| Others |
| AD | Anatomic Design
| Others |
| AD | Ancient Dragon
| Others |
| AD | And Do ....
| Others |
| AD | Andorra
| Others |
| AD | Andorra, Principality of
| Others |
| AD | Andrew Darnall
| Others |
| AD | androstenedione
| Others |
| AD | Anisotropic Disk
| Others |
| AD | Anno Domani
| Others |
| AD | Anno Domini
| Time |
| AD | Anno Domini (Year of Our Lord)
| Others |
| AD | Anno Domini : 'in the year of our Lord'
| Others |
| AD | Anno Domino
| Others |
| AD | Anomalous Dispersion
| Others |
| AD | Ante Diem (before the day)
| Others |
| AD | Ante Diluvium (After the Flood)
| Others |
| AD | Anterior Deltoid
| Others |
| AD | Anterior Descending
| Others |
| AD | Anterior Digastric
| Others |
| AD | Anterior Dorsal
| Others |
| AD | Anterior Drawer
| Others |
| AD | anterodorsal
| Others |
| AD | Anti Dumping
| Others |
| AD | Anti-Diarrhoeal
| Others |
| AD | Anti-Diversity
| Others |
| AD | Anti-Dumb
| Others |
| AD | Antidepressant Drug
| Others |
| AD | Antigenic Determinant
| Others |
| AD | Antiproton Decelerator
| Others |
| AD | Antique Dark
| Others |
| AD | Anxiety Disorder
| Others |
| AD | Aortic Diameter
| Others |
| AD | Aortic Disection
| Others |
| AD | Aortic Dissection
| Others |
| AD | Aperture Door
| Others |
| AD | Application Development
| Others |
| AD | Applications Development
| Others |
| AD | apted AD
| Others |
| AD | Architectural Design
| Others |
| AD | Architectural Digest
| Others |
| AD | Area Director
| Others |
| AD | Arginine Deaminase
| Others |
| AD | Armored Division
| Others |
| AD | Army Department
| Others |
| AD | Arrested Development
| Others |
| AD | Arrhythmic Death
| Others |
| AD | Arrythmogenic Dose
| Others |
| AD | Art Deco
| Others |
| AD | Art Director
| Others |
| AD | Arterial Device
| Others |
| AD | Arterial Distensibility
| Others |
| AD | Artillery Depot
| Others |
| AD | Artist Designer
| Others |
| AD | As Directed
| Others |
| AD | Asperger disease
| Others |
| AD | Assistant Deputy
| Others |
| AD | Assistant Director
| Others |
| AD | Assistant Doctor
| Others |
| AD | Assistive Device
| Others |
| AD | Associate Degree
| Others |
| AD | Associate Director
| Others |
| AD | Assumed Datum
| Others |
| AD | ASTIA (Armed Services Technical Information Agency) Document
| Others |
| AD | Astronomsko Drustvo
| Others |
| AD | Atherogenic Diet
| Others |
| AD | Athletic Dictator
| Others |
| AD | Athletic Director
| Others |
| AD | Atlantic and Danville Railway (Norfolk, Franklin and Danville Railway)
| Others |
| AD | Atopic Dermatitis
| Others |
| AD | Atopic Disease
| Others |
| AD | Attachment Device
| Others |
| AD | Attack Damage
| Others |
| AD | Attention defecit
| Others |
| AD | Attention Deficit
| Others |
| AD | Audio Disk
| Others |
| AD | Auditory Discrimination
| Others |
| AD | Aunt Dorothy
| Others |
| ad | auris dexter ( Latin) right ear
| Others |
| AD | Auris Dexter (Right Ear)
| Others |
| AD | Auris Dextra (right ear)
| Others |
| AD | Authorized Dealer
| Others |
| AD | Autistic Disorder
| Others |
| AD | Auto Date
| Others |
| AD | Auto Dueler
| Others |
| AD | Autoimmune Disease
| Others |
| AD | Automatic Distribution
| Others |
| AD | Autonomic Dysfunction
| Others |
| AD | Autonomic Dysreflexia
| Others |
| AD | Autonomous Driving
| Others |
| AD | Autosomal Dominant
| Others |
| AD | Average Difference
| Others |
| AD | Aviation Division
| Others |
| AD | Awesome Dude
| Others |
| AD | Axillary Dissection
| Others |
| AD | axiodistal
| Others |
| AD | Destroyer Tender (Auxiliary, Destroyer)
| Others |
| AD | drug addict
| Others |
| AD | FAADC2I Dual Workstation-class computer unit
| Others |
| AD | Up to
| Others |