Ag‐grade″ (?), v. t. [imp. & p. p.Aggraded; p. pr. & vb. n.Aggrading.] (Phys. Geog.) To bring, or tend to bring, to a uniform grade, or slope, by addition of material; as, streams aggrade their beds by depositing sediment.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.