AD

AD or ad may stand for:

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• Anno Domini (Latin: "In the Year of the Lord"). This year is AD {{CURRENTYEAR}}.
• ad or advertisement, see advertising
• prefix
• Administrative domain
• Air Defence
• Audio Deck
• Auto Desk
• Andorra, ISO 3166-1 alpha-2 country code
• anni Diocletiani
• Assistant Director
• Destroyer Tender, US Navy hull classification symbol
• Alzheimer's disease
• The Air Department of the British Admiralty
• The word ad is Latin for "at" or "to" in some phrases taken from Latin.
• Norfolk, Franklin and Danville Railway (AAR reporting mark AD)
• Microsoft's Active Directory
• is the IATA code for Air Paradise
• In economics, AD is usually used to represent aggregate demand or aggregate expenditure.
• Artium Doctor (Doctor of Arts)
• In physics, AD is Ricardo Carezani's theory of Autodynamics.
• The Fox Network TV program Arrested Development
• In set theory, the axiom of determinacy