noun
a stage in a process of change or development
adjective
relating to or denoting a series of successive stages or degrees
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The artist used a subtle gradation of colors to create a sense of depth in the painting.
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I love how the sunset has a beautiful gradation of colors from pink to orange.
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That hairstyle has a cool gradation going from dark to light at the tips.
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The gradation of emotions in the novel's climax left readers on the edge of their seats.