R Meaning in the Cambridge English Dictionary
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Meaning of “R” in the 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 ​Englishalphabet

Radjective [not gradable]

R adjective [not gradable] (MOVIE)

abbreviation for restricted 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)
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