aggrade

[uh-greyd]

verb (used with object), ag·grad·ed, ag·grad·ing. Physical Geography.

to raise the grade or level of (a river valley, a stream bed, etc.) by depositing detritus, sediment, or the like.

Compare degrade.

Origin of aggrade

First recorded in 1895–1900; ag- + grade

Related formsag·gra·da·tion

[ag-ruh-dey-shuh n] /ˌæg rəˈdeɪ ʃən/, nounag·gra·da·tion·al, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for aggrade

Historical Examples of aggrade

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
Rollin D. Salisbury
In this way they aggrade each portion of it in turn by means of their shifting channels.
The Elements of Geology
William Harmon Norton

British Dictionary definitions for aggrade

aggrade

verb

(tr) to build up the level of (any land surface) by the deposition of sedimentCompare degrade (def. 4)

Derived Formsaggradation (ˌæɡrəˈdeɪʃən), noun

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012