• synonyms


verb (used with object), ag·grad·ed, ag·grad·ing. Physical Geography.
  1. to raise the grade or level of (a river valley, a stream bed, etc.) by depositing detritus, sediment, or the like.
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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


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