English

aggrade

From ad- + grade.

A compound of ad- + grade

Proto-Indo-European *h₂éd ‘near, at’

Proto-Italic *ad ‘toward, to, on, up to, for’

Latin ad ‘to, towards’

English ad-

Proto-Indo-European *gʰradʰ-

Proto-Italic *graðus

Latin gradus ‘a step’

Middle French grade ‘a grade’

English grade

Today it means

verb to raise the level of a river bed by the deposition of sediment

Language periods are conventional ranges, not dates for this word.