ad
| Noun | 1. |  ad - a public promotion of some product or service |
| Adv. | 1. | AD - in the Christian era; used before dates after the supposed year Christ was born; "in AD 200" Synonyms: A.D., anno Domini |
| 1. | AD - Administrative Domain | ||
| 2. | (networking) | ad - The country code for Andorra. |