Christian era Meaning, Definition & Usage

  1. noun the time period beginning with the supposed year of Christ's birth
    Common era.

WordNet

Definitions
  1. the present era, commencing with the birth of Christ. It is supposed that owing to an error of a monk (Dionysius Exiguus, d. about 556) employed to calculate the era, its commencement was fixed three or four years too late, so that 1890 should be 1893 or 1894.

Webster 1913