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/ˈɹeɪdiən/ · noun
(geometry) In the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle..
Use radian when its meaning, tone and grammar fit the full sentence. A synonym is not always a direct replacement.
Radian means (geometry) In the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle..
Common synonyms include rad.
The opposite depends on the specific sense.
Use radian where its definition matches the intended context.
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