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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
“Collins English Dictionary — Complete & Unabridged” 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012


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Word History and Origins

Origin of circular measure1

First recorded in 1870–75
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Example Sentences

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

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

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