a or an is ad

ad = a or an (Lhaesine pronunciation = AHD) (some things Google found for "ad": an extremely common term; ad is short for advertising; .ad is the Internet country code for Andorra; AD stands for Attention Deficit; AD or "Anno Domini" in Latin means "in the year of the Lord"; AD is Artificial Development; a first name; means "through" in Danish; means "hat" in Gaelic and Scottish; means "give" in Hungarian; means "army" in Indonesian; means "at, to" in Italian; means "to, toward" in Latin; means "hell" in Serbian (Latin Script); means "again" in Sindarin; means "name" in Turkish)