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| quantity; number represented by a figure or symbol, a point in the range of a function |
| a system of numerical notation to the base 2, in which each place of a number, expressed as 0 or 1, corresponds to a power of 2 |
radian ra·di·an (rā'dē-ən)
n.
Abbr. rad
A unit of angular measure equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle.
| radian (rā'dē-ən) Pronunciation Key
A supplementary unit of the International System used in angular measure. One radian is equal to the angle subtended at the center of a circle by an arc equal in length to the radius of the circle, approximately 57°17'44.6". |