Definition of radian in English:

radian

Syllabification: ra·di·an
Pronunciation: /ˈrādēən
 
/

noun

Geometry
A unit of angle, equal to an angle at the center of a circle whose arc is 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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Pronunciation: dɪˈmɒrəlʌɪz
verb
cause (someone) to lose confidence or hope