| Pronunciation: | | 'reydeeun
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 WordNet Dictionary |
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| | Definition: | |
[n] the unit of plane angle adopted under the System International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees) |
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RADIAN is a 6 letter word that starts with R. |
| | Synonyms: | | rad |
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| | See Also: | | angular unit, milliradian |
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| Webster's 1913 Dictionary |
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| | Definition: | | \Ra"di*an\, n. [From {Radius}.] (Math.)
An arc of a circle which is equal to the radius, or the angle
measured by such an arc.
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