R
volume
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British pronunciation/ˈɑː/
American pronunciation/ˈɑɹ/
01

the length of a line segment between the center and circumference of a circle or sphere

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r definition and meaning
02

the 18th letter of the Roman alphabet

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03

a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air

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04

(physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole

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R
volume
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British pronunciation/ˈɑː/
American pronunciation/ˈɑːɹ/
01

describing a motion picture that people under the age of 17 need a guardian or parent in order to watch it

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Example
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The circumference of a semicircle is C = π * r, showcasing the presence of pi in geometric calculations.
Language learners may spend time practicing the skill of rolling 'r' sounds to achieve accurate pronunciation in various languages.
I have a hard time getting my tongue around a lot of Spanish words because I can't roll my R's.
Russian speakers often roll the 'r' sound.
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Meaning of "R"

Meaning of "R"
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