Grade, v. t. [imp. & p. p.Graded; p. pr. & vb. n.Grading.] 1. To arrange in order, steps, or degrees, according to size, quality, rank, etc.
2. To reduce to a level, or to an evenly progressive ascent, as the line of a canal or road.
3. (Stock Breeding) To cross with some better breed; to improve the blood of.