/ ɑː(r); NAmE / noun , abbreviation
■ noun
(also r ) [ C , U ] ( pl. Rs , R's , r's / ɑːz; NAmE /) 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 NAmE ) ( in politics in the US ) Republican
4.
( BrE ) (in abbreviations) Royal :
the RAC (= Royal Automobile Club)
5.
( NAmE ) 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')
6.
roentgen
—see also R & B , R & D