This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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v. Present participle of grade.

n. The act or method of arranging in or by grade, or of bringing, as the surface of land or a road, to the desired level or grade.

n. evaluation of performance by assigning a grade or score

n. the act of arranging in a graduated series

n. changing the ground level to a smooth horizontal or gently sloping surface

"That's what we call grading on a curve in the film critic system."

rating    evaluation    order    ordering    building    construction   

grade   

aiding    blading    blockading    braiding    cascading    crusading    degrading    downgrading    evading    fading