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

     

    accretion

     noun
    noun
    BrE BrE//əˈkriːʃn//
     
    ; NAmE NAmE//əˈkriːʃn//
     
    (specialist or formal)
     
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  1. 1[countable] a layer of a substance or a piece of matter that is slowly added to something
  2. 2[uncountable] the process of new layers or matter being slowly added to something the accretion of sand by wind action
  3. Word Origin early 17th cent.: from Latin accretio(n-), from accrescere ‘become larger’, from ad- ‘to’ + crescere ‘grow’.
See the Oxford Advanced American Dictionary entry: accretion