• WordNet 3.6
    • v aggrade build up to a level by depositing sediment
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Webster's Revised Unabridged Dictionary
    • v. t Aggrade (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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Century Dictionary and Cyclopedia
    • aggrade In geology, to grade up; fill up: the opposite of degrade or wear away. A river aggrades its valley when, owing to an increase in the load of detritus or to a decrease of carrying power of its current (as a result of diminution in volume or of tilting of the land), some of its load has to be laid down along its course.
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In literature:

The desert country toward the mouth is largely a sandy or gravelly aggradation plain of the river.
"Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 6" by Various
Its deposits tend to aggrade (build up) the flat which its meanderings develop.
"The Geography of the Region about Devils Lake and the Dalles of the Wisconsin" by Rollin D. Salisbury
In this way each part of the fan is aggraded and its symmetric form is preserved.
"The Elements of Geology" by William Harmon Norton