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Definition(s) of “R”
r
abbreviation
• recto.
• (giving position or direction) right : l to r: Evan, Nick, and David.
• Law rule : under r 7.4 (6) the court may hear an application immediately.
symbol
• radius : 2πr.
• Statistics correlation coefficient : sigmoidoscopic and symptom scores also showed a significant correlation with each other (r = 0.91).
correlation coefficient
noun Statistics
a number between −1 and +1 calculated so as to represent the linear dependence of two variables or sets of data. (Symbol: r.)
R 1 |är| (also r)
noun ( pl. Rs or R's)
the eighteenth letter of the alphabet.
• denoting the next after Q in a set of items, categories, etc.
PHRASES
the R months the months with R in their names (September to April), considered to be the season for eating oysters.
the three Rs reading, writing, and arithmetic, regarded as the fundamentals of learning.
R 2
abbreviation
• rand : a farm worth nearly R1,3-million.
• Réaumur : 198.6 °R.
• Regina or Rex : Elizabeth R.
• (also ®) registered as a trademark.
• (in the U.S.) Republican : congressman Henry Hyde (R-Illinois).
• restricted, a rating in the Voluntary Movie Rating System that children under 17 require an accompanying parent or adult guardian for admission.
• (on a gearshift) reverse.
• ( R.) River (chiefly on maps) : R. Cherwell.
• roentgen(s).
• rook (in recording moves in chess) : 21.Rh4.
symbol
• Chemistry an unspecified alkyl or other organic radical or group. [ORIGIN: abbreviation of radical .]
• electrical resistance.
• Chemistry the gas constant.
roentgen |ˈrentgən; ˈrənt-; -jən| (abbr.: R)
noun
a unit of ionizing radiation, the amount producing one electrostatic unit of positive or negative ionic charge in one cubic centimeter of air under standard conditions.
ORIGIN 1920s: named after Wilhelm Conrad Röntgen (1845–1923), German physicist, discoverer of X-rays.
gas constant (Symbol: R)
noun Chemistry
the constant of proportionality in the gas equation. It is equal to 8.314 joule kelvin −1 mole −1.