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early 13c., from Old French degré (12c.) "a step (of a stair), pace, degree (of relationship), academic degree; rank, status, position," said to be from Vulgar Latin *degradus "a step," from Late Latin degredare, from Latin de- "down" (see de-) + gradus "step" (see grade (n.)).
Most modern senses date from Middle English, from notion of a hierarchy of steps. Meaning "a grade of crime" is 1670s; that of "a unit of temperature" is from 1727. The division of the circle into 360 degrees was known in Babylon and Egypt. It is perhaps from the daily motion of the sun through the zodiac in the course of a year.
degree de·gree (dĭ-grē')
Abbr. deg, deg. A unit of measure on a temperature scale.
A division of a circle, equal to 1/360 of its circumference.
A position or rank within a graded series.
In geometry, a unit of measurement of angles, 1/360 of a circle. In physics, a unit of temperature (see Celsius, Fahrenheit, and Kelvin scale). A degree on the Fahrenheit scale is smaller than a degree on the Celsius or Kelvin scale. Degrees on the Celsius and Kelvin scales are the same size.