circular measure

noun

1. a measurement system for circles: 1 circle = 360 degrees (4 quadrants); 1 quadrant = 90 degrees; 1 degree = 60 minutes; 1 minute = 60 seconds.

circular measure

noun

1. the measurement of an angle in radians

Word History and Origins

Origin of circular measure¹

First recorded in 1870–75

Example Sentences

The radius of the sphere is assumed to be unity, and z and γ are expressed in circular measure.

From Project Gutenberg

Nauticus lays down—quite correctly—that the sine of an angle is less than its circular measure.

From Project Gutenberg