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a unit used to measure angles. 1 radian is the angle in a unit circle where the radius is equal to the arc. since pi radians=180 degrees, radians are usually expressed in terms of pi.
This angle measures pi/2 radians(90 degrees).
by 5'1"Racer June 05, 2005
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a small fit girl, usually a box of rocks. easy to get along with. A simpleton kind of girl.
Guy: wow radian is so tight
jealous girl: she is a simpleton
guy: what is that
by TheRealHunter March 07, 2016
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