The definition of AR is an abbreviation for the state of Arkansas.
An example of the usage of AR is to use the abbreviation when addressing an envelope.
AR is an abbreviation for Army Regulation.
An example of an AR is the type and condition of uniform men and women in the Army must wear.
A & R definition by Webster's New World
Artist(s) and Repertoire: with reference to those officials of commercial recording companies who select the performers and supervise the production of recordings
ad-: used before r
of, relating to, like, of the nature of: singular, polar
the agent of a particular action: registrar
Origin: modeled on scholar, etc.
Origin: ; from Middle English -er ; from Old French -er, -ier, -air ; from Classical Latin -aris; or directly ; from Classical Latin -aris; also ; from Classical Latin -arius, a suffix of nouns of agency