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abbreviation for phrase anno Domini (Latin for in the year of the Lord); a calendar system differentiating the era after the birth of Jesus from the era before Christ, or bc; so-called Christian Era invented in 6th century by Dionysius Exiguus to calculate correct date of Easter; terms Common Era (ce) and Before Common Era (bce) sometimes used instead of bc and ad; system became widely used in 8th century; now used throughout the world, though different calendar and dating systems also used by Hindus, Muslims, and Jews.
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