adjective
relating to or characterized by accretion, the process of growth or increase by the gradual accumulation of additional layers or matter
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The accretionary process of sediment buildup over millions of years formed the layers of rock we see today.
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The slow accretionary growth of the coral reef is fascinating to watch.
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The accretionary savings in my bank account are finally starting to add up.
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His accretionary knowledge of the subject made him an expert in the field.