accretionary

/əˈkriːʃəˌnɛri/
adjective
  1. Relating to or involving gradual growth or increase by the addition of new layers or parts.
    • The accretionary process of the coral reef takes thousands of years.
    • Geologists study accretionary wedges to understand how mountains form.
    • The company's accretionary growth came from slowly adding new product lines.
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