What does AD stand for?

What does AD mean?

AD	American Dog Miscellaneous » Dogs Related
AD	Artist Designer Academic & Science » Architecture
AD	Academic Decathlon Community » Sports
AD	After the Downfall Governmental
AD	Ancient Dragon Miscellaneous » Science Fiction
AD	Always Dependable Business » Positions
AD	Anatomic Design Medical » Laboratory
AD	After Dark Community » Performing Arts
AD	Acute Disorder Medical » Physiology
AD	Always Demanding Business » Positions
AD	Anno Domani Community » Religion
AD	Additional Delivery Business » General
AD	After Democracy Governmental » US Government
AD	After a Date Governmental » Military
AD	Audio Disks Community » Media
AD	Auto Date Business » General
AD	Awesome Dude Internet » Chat
AD	AfterDark Screensaver Computing » File Extensions
AD	Amoebic Dysentery Medical » Hospitals
AD	Astronomsko Drustvo Academic & Science » Astronomy
AD	Aunt Dorothy Miscellaneous » Names and Nicknames
AD	AMD Corporation Governmental » Suppliers
AD	Anno Domini : 'in the year of our Lord' International » Latin
AD	Alfred Daniel Miscellaneous » Names and Nicknames
AD	Asamblea Democrática International » Spanish