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aggrade
ag·grade [ ə gráyd ] (past and past participle ag·grad·ed, present participle ag·grad·ing, 3rd person present singular ag·grades)


transitive verb 
Definition:
 
raise ground level: to build up a land surface or streambed through the natural deposition of material.
See also  degrade (sense 4)

[Early 20th century. Back-formation < aggradation<ag- + degradation]

ag·gra·da·tion [ àggrə dáysh'n ] noun
ag·gra·da·tion·al adjective
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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