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See also: Appendix:Variations of "ad"
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- Latin anno Domini, in the year of our Lord, used to specify numbered years counting from the once estimated birth of Christ in year 1. Usually placed before years (but see notes), and always placed after centuries. Often written in small caps. This year is AD 2013.
- Jan. 1, AD 250.
- From the 2nd century BC to the 3rd century AD.
- assistant director.
- (military) air defence or air defense
- (US, Navy) Auxiliary Destroyer - a naval tender, a destroyer tender that tends to destroyers
- The Chicago Manual of Style as well as most house styles require placing the AD before the number of the year, although in casual use it is frequently found following the year.
- Some use CE for Common Era, which is more secular in nature, to avoid potential Christian bias.
- "AD" in the expression "in the year AD 1990" is not normally used since in such a year it is taken for granted. In "Vesuvius erupted in AD 79" it is expected.
- (destroyer tender): AS
- the Swedish Labour Court; Abbreviation of arbetsdomstolen.
- a combination of vitamin A and D, given to children (in 2008 replaced by only vitamin D)
- Abbreviation of art director.