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From: Webster's Revised Unabridged Dictionary (1913)

 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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