Radian Definition

rādē-ən
noun
The basic unit of plane angle in the SI system, equal to 57° 17′ 44.8″ (57.29578°, the angle formed at the center of a circle by two radii cutting off an arc whose length is equal to the radius of the circle): one degree equals 0.017454 radian and 360 degrees equals 2π radians.
Webster's New World
Synonyms:
rad

Other Word Forms of Radian

Noun

Singular:
radian
Plural:
radians

Origin of Radian

  • radi(us) –an

    From American Heritage Dictionary of the English Language, 5th Edition

  • From radi(us) + -an

    From Wiktionary

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