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Definitions and Synonyms of r | Another word for r | What is r?

Definition 1: the length of a line segment between the center and circumference of a circle or sphere - [noun denoting attribute]

Synonyms for r in the sense of this definition

(r is a kind of ...) the linear extent in space from one end to the other; the longest dimension of something that is fixed in place

"the length of the table was 5 feet"

(... is a kind of r ) the apparent radius of a celestial body when viewed as a disc from the earth

(... is a kind of r ) the radius of the circle of curvature; the absolute value of the reciprocal of the curvature of a curve at a given point

(... is part of r) the length of a straight line passing through the center of a circle and connecting two points on the circumference

Definition 2: the 18th letter of the Roman alphabet - [noun denoting communication]

(r is a kind of ...) the conventional characters of the alphabet used to represent speech

"his grandmother taught him his letters"

(... is a member of r) the alphabet evolved by the ancient Romans which serves for writing most of the languages of western Europe

Definition 3: a unit of radiation exposure; the dose of ionizing radiation that will produce 1 electrostatic unit of electricity in 1 cc of dry air - [noun denoting quantity]

Synonyms for r in the sense of this definition

(r is a kind of ...) a measure of radioactivity

Definition 4: (physics) the universal constant in the gas equation: pressure times volume = R times temperature; equal to 8.3143 joules per kelvin per mole - [noun denoting quantity]

Synonyms for r in the sense of this definition

(r is a kind of ...) a number representing a quantity assumed to have a fixed value in a specified mathematical context

"the velocity of light is a constant"

(r belongs to category ...) the science of matter and energy and their interactions

"his favorite subject was physics"

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