I. R 1 BrE AmE , r /ɑː $ ɑːr/ noun ( plural R’s , r’s )
1 . [uncountable and countable] the 18th letter of the English alphabet
2 . [singular, uncountable] American English used to describe a film that has been officially approved as only suitable for people over 17
⇨ THREE R’S
II. R 2 BrE AmE
1 . American English the written abbreviation of Republican , used after a politician’s name to show that he or she belongs to the Republican Party in the US ⇨ D :
Steve Gunderson (R)
2 . British English the written abbreviation of regina (=queen) , used after the name of the queen of the United Kingdom:
Elizabeth R
3 . ( also R. ) the written abbreviation of river, used especially on maps
⇨ ↑ R & B , ↑ R & D , ↑ R & R