downgradient adjective 2adverb 2forms 2 adjective2 •A position down along a gradient from a starting position. •a location that receives groundwater from another location; similar to downstream.Monitoring wells are installed downgradient of a contamination source to detect a contaminant plume. adverb2 •The direction along a gradient. •a direction that groundwater flows toward. formsmore downgradient · most downgradient