Definition of "gradational" [gra•da•tion•al]

• By regular steps or gradations. (adjective)
• Of or pertaining to gradation. (adjective)

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• "Here also it is obvious, that although John only presents these opposites in their generic form, yet we are necessarily led to the idea of gradational differences in the actual life."
• "The northwestern boundary is gradational, as more gentle slopes and lower relief are found towards the center of the region."
• "Depletion is slow for abundant also found mainly in deposits of relatively low geochemical concentration with gradational boundaries-especially slow if they can be recycled after use."