— aggradation /ag'reuh day"sheuhn/ , n. — aggradational , adj.
/euh grayd"/ , v.t., aggraded, aggrading . Phys. Geog.
to 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 ]