degree
The word 'Grad' in German is used to refer to a degree, both in the sense of an academic degree and in the sense of a unit of measurement for angles. In the context of academics, it can be used to refer to a Bachelor's, Master's, or Doctoral degree. In the context of measurement, it is used to express the size of an angle, where one full circle is equal to 360 degrees. The plural form of 'Grad' is 'Grade'.
It's 30 degrees outside
In this sentence, 'Grad' is used to refer to temperature in degrees Celsius, a common measure of temperature used in Germany.
We have a 90 degree angle
In this instance, 'Grad' is used to denote the measurement of an angle in degrees. This is a common use of the word 'Grad' in mathematical and geometrical contexts.
I completed my course of study with a first degree
In this sentence, 'Grad' means degree in the educational context. This is similar to how 'degree' is used in English, to signify the level of completion in education.