The full form of “ad” can vary depending on the context. Here are a few common meanings:
- Advertisement: In marketing and media, “ad” commonly refers to an advertisement.
- Anno Domini: In the context of dates, “AD” stands for “Anno Domini,” which is Latin for “in the year of our Lord,” referring to years in the Gregorian calendar after the birth of Jesus Christ.
If you have a specific context in mind, please let me know!