Definition of gradation noun from the Oxford Advanced Learner's Dictionary

     

    gradation

     noun
    noun
    BrE BrE//ɡrəˈdeɪʃn//
     
    ; NAmE NAmE//ɡrəˈdeɪʃn//
     
     
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  1. 1[countable, uncountable] (formal) any of the small changes or levels which something is divided into; the process or result of something changing gradually gradations of colour gradation in size
  2. 2(also graduation) [countable] a mark showing a division on a scale the gradations on a thermometer
  3. Word Origin mid 16th cent.: from Latin gradatio(n-), based on gradus ‘step’.
See the Oxford Advanced American Dictionary entry: gradation