A.D = Anno Domini Latin for "year of our lord" B.C.E = Before the Common Era C.E = Common Era this is a synonym for A.D I remember learning B.C and B.C.E mean the same although B.C.E is used more in Science to show respect spiritually. If a person is refering to Science they will most likely say B.C.E instead of B.C ...hope this helps.
