What does GRADE mean?

noun

1. a body of students who are taught together“early morning classes are always sleepy”
2. a relative position or degree of value in a graded group“lumber of the highest grade”
3. the gradient of a slope or road or other surface“the road had a steep grade”
4. one-hundredth of a right angle
5. a degree of ablaut
6. a number or letter indicating quality (especially of a student's performance)“she made good marks in algebra”
7. the height of the ground on which something stands“the base of the tower was below grade”
8. a position on a scale of intensity or amount or quality“a moderate grade of intelligence”