Webster's English Dictionary

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gradation

gra.da.tion \gra--'da--sh*n, gr*-\ \-shn*l, -sh*n-*l\ \-e-\ n 1a: a series 
   forming successive stages  1b: a step or place in an ordered scale  2: an 
   advance by regular degrees  3: a color scale  - gra.da.tion.al aj