accretion

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ac|cre|tion /əkr'iːʃən/ (accretions)
1 [N-COUNT]
An accretion is an addition to something, usually one that has been added over a period of time. (FORMAL)
The script has been gathering editorial accretions for years.
2 [N-UNCOUNT]
Accretion is the process of new layers or parts being added to something so that it increases in size. (FORMAL)
A coral reef is built by the accretion of tiny, identical organisms.

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