The
gradian is a
unit of measurement of an
angle, equivalent to of a
turn, of a
degree or of a
radian. It is also known as
gon (from Greek
γωνία/
gōnía for angle),
grad, or
grade. In continental
Europe, the French term
centigrade was in use for one hundredth of a grad. This was one reason for the adoption of the term
Celsius to replace centigrade as the name of the temperature scale.