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According to WordNet, the noun "R" has 3 sense(s).
113590079 (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole.
113646031 a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air.
106833004 the 18th letter of the Roman alphabet.
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