circular measure

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

Origin:
1870–75

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World English Dictionary
circular measure
 
n
the measurement of an angle in radians

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
While this measure of training clearly has flaws, it certainly seems preferable to the circular measure of usual training.
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