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Anno Domini (abbreviated as AD or A.D., sometimes found in the form Anno Domine) and Before Christ (abbreviated as BC or B.C.) are designations used to label or numbers ears in the Julian and Gregorina Calendars.

The BC/AD dating system was devised by medieval monks and based on an estimate of Jesus's birth year. This estimate has later proven to be off by about six years.

The more recent BCE/CE dating system ("Before the Current Era" and "Current Era," respectively) is simply the BC/AD dating system relabeled to remove religious references.

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Q: What are the full forms of 'AD' and 'BC'?
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