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Definitions of PRI:
noun: Initialism of Public Radio International.
noun: (telecommunications) Initialism of primary rate interface. [(telecommunications) an ISDN service delivered over T1, E1 or J1 datalines, with delivery of connections between 1472 kilobits per second and 1984 kilobits per second (kibibits)]
noun: (nutrition) Initialism of Population Reference Intake.