Degree, in Geometry, the 360th part of the circumference of a circle, into which number of parts all circles are considered to be divided; it is indicated by a small ° near the top of the figure; thus, 45° is forty-five degrees. Each degree is subdivided into sixty smaller parts, called minutes, and denoted by the mark'; and these again are each subdivided into sixty parts, called seconds, and marked thus"; thus, 45° 12' 20" is forty-five degrees twelve minutes and twenty seconds.