Entry 1 sense Webster, 1913 Anno Domini /ăn'-ō däm'-ĭn-ē/ · An·no Dom·i·ni · IPA /ˈæn.oʊ ˈdɑ.mə.ni/ 01 In the year of the Christian era; as, a. d. 1887. 1. In the year of the Christian era; as, a. d. 1887.