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 accretional growth of the coral reef is a result of deposition of calcium carbonate by marine organisms.
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The accretional process of building the sandcastle was slow but steady.
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The accretional pile of laundry in my room is getting out of control.
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The accretional effect of small acts of kindness can lead to a significant positive impact on society.