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Definition of radian

radian

/ˈreɪdiən/
ra · di · an
Plural:radians
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radian Lexical Profile

radian Game Scores & Validity

• noun

1

The standard unit of angular measure in the International System of Units (SI), equal to the central angle of a circle subtended by an arc whose length is equal to the radius of the circle (approximately 57.296 degrees).

Example

"Before evaluating trigonometric functions in calculus, ensure your scientific calculator is set to radian mode rather than degrees."

• Rhymes for radian

• Nearby Words

radde viper
radial
radially
radian
radiance
radiant
radiantly

Word Origin & Etymology

Coined in the early 1870s by Scottish physicist James Thomson from the Latin 'radius' (meaning 'spoke of a wheel' or 'ray') combined with the suffix '-an'.

Cite this Entry

Wordmom. (2026). Definition of Radian. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/radian
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