AD commonly refers to Anno Domini, Latin for "In the Year of (Our) Lord", applied to years following 1 BC in the Julian and Gregorian calendars.
AD or Ad may also refer to:
Media and culture
- Advertisement, the promotion of an item, service, company, and/or idea
- A.D. (film), a television miniseries set in ancient Rome
- A.D.: New Orleans After the Deluge, a nonfiction graphic novel about Hurricane Katrina
- AD (band), a Christian rock band from 1984-1988
- Algemeen Dagblad, a Dutch newspaper
- American Dad!, a Fox Network animated program
- Anno Domini (gallery), a contemporary art gallery in San Jose, California
- Arrested Development (TV Series), a Fox Network comedy
- Art director, the administrator in charge of art and design for a magazine or newspaper
- Assistant director, a film crew member who manages various tasks
- "at", "to", or "for", in some Latin phrases (such as ad lib or ad nauseam)
- Athletic director, the administrator of the athletics program, usually at an educational institution
- United States Academic Decathlon, a United States high school based academic competition
Politics and history
Military
- Air defense, 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 component of Microsoft Windows that provides distributed user management and authentication
- 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
- Antiproton Decelerator, a machine to cool down antiprotons at the CERN physics laboratory
- 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 supporting the cost-effective deconstruction of complex materials
- Atypical depression, a depression that still allows one to feel positive moods
- Adamantyl (Ad), an abbreviation in organic chemistry for Adamantyl
- Sharpless asymmetric dihydroxylation, a type of organic chemical reaction
- Approximate digestibility, in study of dietary efficiency, a rough unit measure of the digestibility of animal feed
- Anti-diarrheal, a medication used to treat diarrhea
- Addison's disease, a rare endocrine disorder in which the adrenal glands do not produce enough steroid hormones
- Autosomal Dominant,
Transportation
People
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