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The Collaborative International Dictionary of English v.0.48:

Aggrade \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. [Webster 1913 Suppl.]