What is A. R? Definition of A. R in Black's Law Dictionary
A. R. Anno Regni. In the year of the reign; as
A. R. V. R. 22, (Anno Regni Victoriae Reginae vicesimo secundo) in the twenty-second year of the reign of Queen Victoria.
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That's the definition of A. R in Black's Law Dictionary - Courtesy of Cekhukum.com.