gradation
US /ɡreɪˈdeɪ.ʃən/
UK /ɡreɪˈdeɪ.ʃən/
1.
a scale or a series of successive changes, stages, or degrees
:
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The colors of the sunset showed a beautiful gradation from orange to purple.
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The teacher explained the concept with a clear gradation of difficulty.
2.
the process of arranging in a series of stages or degrees
:
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The artist achieved a smooth gradation of tones in the painting.
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The training program involves a careful gradation of skills.