Meaning of “gradation” in the English Dictionary

"gradation" in American English

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gradationnoun [ C ]

us /ɡreɪˈdeɪ·ʃən, ɡrə-/

a gradual change, or one stage in a series of changes:

There are many gradations of color in a rainbow.

(Definition of “gradation” from the Cambridge Academic Content Dictionary © Cambridge University Press)