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Growth or increase in size by gradual external addition, fusion, or inclusion.
(noun)
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Something contributing to such growth or increase: "the accretions of paint that had buried the door's details like snow” ( Christopher Andreae).
(noun)
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Biology The growing together or adherence of parts that are normally separate.
(noun)
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Geology Slow addition to land by deposition of water-borne sediment.
(noun)
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Geology An increase of land along the shores of a body of water, as by alluvial deposit.
(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.