Meaning of “R” in the English Dictionary

american-english dictionary

"R" in American English

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Rnoun [ C ]

plural R’s, Rs, r’s or rs also r us /ɑr/

R noun [ C ] (LETTER)

the 18th letter of the English alphabet

R adjective [ not gradable ] (MOVIE)

abbreviation forrestricted

Note: Used in the US for movies that people under the age of 17 will not be allowed in to see except if they are with an adult.

(Definition of “R” from the Cambridge Academic Content Dictionary © Cambridge University Press)