WordReference Random House Unabridged Dictionary of American English © 2026
ag•grade
(ə grād′),USA pronunciation v.t., -grad•ed, -grad•ing. [Phys. Geog.]
ag•gra•da•tion
(ag′rə dā′shən),USA pronunciation n.
ag′gra•da′tion•al, adj.
- Geographyto raise the grade or level of (a river valley, a stream bed, etc.) by depositing detritus, sediment, or the like. Cf. degrade.
- 1895–1900; ag- + grade
'aggrade' also found in these entries (note: many are not synonyms or translations):