accretion

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accretion ˈkriːʃən/ noun
plural accretions
accretion
ˈkriːʃən/
noun
plural accretions
Learner's definition of ACCRETION
[noncount] : a gradual process in which layers of a material are formed as small amounts are added over time often used figuratively
[count] : something that has grown or accumulated slowly : a product or result of gradual growth