Years ‘after the birth of Christ’ (Anno Domini). The" lower case ‘ad’ represents uncalibrated radiocarbon years; the capitals ad denote a calibrated radiocarbon date, or a date such as an historically derived one, that does not need calibration (see Table 8, page 422). There is no year 0: AD 1 is the same year as 1 bc.
The Macmillan dictionary of archaeology, Ruth D. Whitehouse, 1983Copied