Plural of grading; the process of assigning grades or levels, or the physical work of leveling ground to a certain slope.
From 'grading' (present participle of 'grade') plus plural '-s'. 'Grade' comes from Latin 'gradus' (step, degree). The term expanded from educational contexts to construction and engineering.
Road gradings saved countless lives—engineers use specific angle calculations to ensure water drains properly and vehicles don't tip, which is why highways have that subtle slope you usually don't even notice!
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