Common Era. Alternate dating method corresponding to A.D., Anno Domini, or the Year of our Lord. This is becoming more and more standard in academic works as Westerners begin to more freely acknowledge that they share this planet with more than four billion non-Christians who really do not care when Jesus was born. 
Common Era. Synonymous with A..D. but without religious bias. 
Common Era; indicates that a time division falls within the Christian era; same as A.D.