Longman Dictionary of Contemporary English homepage

R

 noun
     
Related topics: Letters and punctuation
R , r plural R's, r's
1SLA [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
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.

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