[ uh-greyd ]
/ əˈgreɪd /

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 forms

ag·gra·da·tion [ag-ruh-dey-shuh n] /ˌæg rəˈdeɪ ʃən/, nounag·gra·da·tion·al, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for aggrade

British Dictionary definitions for aggrade


/ (əˈɡreɪd) /


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

Derived Forms

aggradation (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