{{Wiktionarypar3|AD|ad-|ad}}
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'''AD''' and '''Ad''' may refer to:

*[[Anno Domini]], Latin for "In the Year of (Our) Lord", applied to years in the Julian and Gregorian calendars following 1 BC
*[[Advertisement]], the promotion of an item, service, company, and/or idea

==Media and culture==
*[[Arrested Development (TV Series)]], a Fox Network TV program
*[[American Dad!]], a Fox Network Animated Program
*[[Assistant director]], a film crew member who manages various tasks
*[[Art director]], the administrator in charge of art
*[[Athletic director]], the administrator of the athletics program, usually at an educational institution
*[[AD (band)]], a Christian rock band from 1984-1988
*[[A. D. (television)]], a 1985 miniseries concerning early Christian history
*[[Algemeen Dagblad]], a Dutch newspaper
*[[Anno Domini (gallery)]], a contemporary art gallery in San Jose, California
*[[United States Academic Decathlon|Academic Decathlon]], a United States high school based academic competition
*"at", "to", or "for", in some [[Latin phrases]] (such as ''ad lib'' or ''ad nauseam'')
*[[AD Music]], a record label
*[[Ad]], columnist in the English newspaper, The Saturday Sport (see also International Fanny Magnet)

==Politics and history==
*[[Andorra]], a small country in the Pyrenees
**[[.ad]], Andorra's ccTLD (Internet Top Level Domain)
**Andorra's [[ISO 3166-1]] country code
*[[Action Directe (terrorist group)]], a French left-wing terrorist group
*[[Democratic Action]] (Spanish: ''Acción Democrática''), a Venezuelan social democratic party
*[[Democratic Alternative (Malta)]] (Maltese: ''Alternattiva Demokratika''), the Maltese Green party
*[[Aad (Omani tribe)]], a destroyed civilization mentioned in the Quran
*[[Anno Diocletiani]], the Era of (Emperor) Diocletian, an alternate year-numbering start date
Anno Domini or AD are also a death metal band from Sydney Australia who formed at Turramurra High School in about 2005, 2005.

==Military==
*[[Air defence]], anti-aircraft weaponry and systems
*[[Accidental discharge]], the mistaken firing of a firearm
*[[Active duty]], a status of full duty or service, usually referencing full service in the armed forces
*[[Destroyer Tender]] (US Navy Hull Classification: AD), support ships to aid the operation of a fleet of destroyers
*The [[Air Department]], part of the British Admiralty

==Science and technology==
* [[Adenovirus]], viruses of the family Adenoviridae.
* [[Alzheimer's disease]], a disease leading to the degeneration of neural function and dementia, usually seen in older people
* [[Active Directory]], a Microsoft administration program
* [[Aggregate demand]], the total demand curve of an entire economy that is the sum of each individual's demand
* [[Automatic differentiation]], a way to speedily compute derivatives in computer programming
* [[Axiom of determinacy]], a set theory axiom inconsistent with the Axiom of Choice
* [[Autodynamics]], an alternate to special relativity proposed by Ricardo Carezani in physics
* [[Audio description]], a narration track for blind and visually impaired viewers of media such as TV and film
* [[Administrative domain]], a collection of hosts and routers into one network
* [[Analog Devices]], a multinational producer of semiconductor devices.
* [[Analog-to-digital converter]] (A/D), a circuit which converts continuous analog signals to discrete digital values
* [[Active Disassembly]], a technology involving specially designed building materials and components which are sturdy yet can easily be decomposed
* [[Autonomic Dysreflexia]], a condition in which "unreachable" parts of the [[nervous system]] (for instance, those beneath a damaged spine) malfunction
* [[Atypical depression]], a depression which makes you unable to express positive moods.

==Transportation==
* [[Airworthiness Directive]], requirements on legal usage of airplanes given by the FAA
* [[Air Paradise]] (IATA code: AD), a defunct Indonesian airline
* [[Atlantic & Danville]] (AAR reporting mark: AD), a defunct railway acquired by the (also now defunct/merged) [[Norfolk, Franklin and Danville Railway]]

==People==
<!-- Note: This is not for anyone whose initials are "A. D." It is for people commonly known as "AD" and only that as a nickname. -->
* [[Ad Tak]], Dutch cyclist
* [[Adalius Thomas]], football player
* [[Antonio Davis]], basketball player
* [[Adelius Thomas]], basketball player
* [[Adrian L. Peterson|Adrian Peterson]], football player, for "All Day"

==Other==
*[[Associate's Degree]], an academic degree

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