Jisho

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Noun
1. Common Era; CE; Christian Era; anno domini; AD
2. Western (Gregorian) calendar
Wikipedia definition
3. Anno DominiAnno Domini (abbreviated as AD or A.D. ) and Before Christ (abbreviated as BC or B.C. ) are designations used to label or number years used with the Julian and Gregorian calendars. This calendar era is based on the traditionally reckoned year of the conception or birth of Jesus of Nazareth, with AD counting years after the start of this epoch, and BC denoting years before the start of the epoch. There is no year zero in this scheme, so the year AD 1 immediately follows the year 1 BC.
Read “Anno Domini” on English Wikipedia
Read “西暦” on Japanese Wikipedia
Read “Anno Domini” on DBpedia

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