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# Anno Domini Anno Domini, meaning "in the year of our Lord" in Latin, is the calendar era used in the Western calendar system that counts years forward from the traditionally calculated birth year of Jesus Christ. It matters because it's the dating system used by most of the world today for civil purposes, making it fundamental to how we organize dates and historical timelines globally.
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Anno Domini (AD) and before Christ (BC) qualify years in the Gregorian and Julian calendars, whose epoch is the traditional year of the conception or birth of Jesus. AD counts years since the epoch, BC the years before the epoch.