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accretion  - definition and synonyms

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noun [countable/uncountable] accretion pronunciation in British English /əˈkriːʃ(ə)n/
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singularaccretion
pluralaccretions
  1. 1
    formal a gradual increase in the size or amount of something through the addition of new parts
  2. 2
    science a layer of a substance that gradually forms on a rock or area of land, making it bigger

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