The definition of an ad is an abbreviation for advertisement, an image or statement that sells a product or service.(abbreviation)
The page in a magazine selling makeup is an example of an ad.
A.D., an abbreviation for Anno Domini, is Latin for after the birth of Christ and literally means “in the year of our Lord.”(abbreviation)
An example of A.D. is the date 200 A.D.
See ad in Webster's New World College Dictionary
Origin: L Anno Domini, in the year of the Lordof the Christian era: used with dates
Origin: L ad-, to, at, toward; akin to at
Origin: Gr -as, -ad-
Origin: L ad, toward
See ad in American Heritage Dictionary 4
Origin: , from ad, to; see ad- in Indo-European roots.
Origin: From Latin ad, to; see ad- in Indo-European roots.
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