Definition of radian in English:


Line breaks: ra¦dian
Pronunciation: /ˈreɪdɪən


  • A unit of measurement of angles equal to about 57.3°, equivalent to the angle subtended at the centre of a circle by an arc equal in length to the radius.
    More example sentences
    • The inverse of the radius of the circle equals the curvature in radians / m.
    • The sliding displacement between doublets may be found by multiplying the shear angle, in radians, by the interdoublet distance.
    • Given that the field oscillates at 60Hz, this gives me a phase angle of 0.4PI radians between samples.

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