R

Universal Words noun, abbreviation noun (also r) [C,U] (plural R's, r's ) the 18th letter of the English alphabet: 'Rose' begins with (an) R / 'R'. IDIOMS see THREE abbreviation 1 (BrE) Queen; King (from Latin 'Regina; Rex'): Elizabeth R. 2 (R.) (especially on maps) River: R. Trent 3 (also R. especially in AmE) (in politics in the US) REPUBLICAN 4 (BrE) (in abbreviations) Royal: the RAC (= Royal Automobile Club) 5 (AmE) a label for a film/movie that is not suitable for people under the age of 17 to see without an adult present (abbreviation for 'restricted') seealsoR<B, R.>D.