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Definition of R noun from the Oxford Advanced Learner's Dictionary

R

noun
 
/ɑː(r)/
 
/ɑːr/
(also r)
[countable, uncountable]
(plural Rs, R’s, r’s
 
/ɑːz/
 
/ɑːrz/
)
Idioms
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  1. [countable] the 18th letter of the English alphabet
    • ‘Rose’ begins with (an) R/‘R’.
    see also A & R, R & R
  2. [uncountable]
    (also R number [countable])
    a way of measuring how quickly a virus spreads through a population by calculating the average number of people who get an infection from just one person with the virus (the abbreviation for ‘reproduction number’ or ‘reproductive number’)
    • We are still seeing new infections every day and the R is close to 1.
    Topics Healthcarec2, Scientific researchc2
Idioms
the three Rs
  1. (old-fashioned) reading, writing and arithmetic, thought to be the most important parts of a child’s education
See R in the Oxford Advanced American Dictionary
Check pronunciation: R

Nearby words

utilize
verb
 
 
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OPAL written words
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