1) N-COUNT An accretion is an addition to something, usually one that has been added over a period of time. [FORMAL]

...the mythical structure has been overlaid by literary accretions.

2) N-UNCOUNT Accretion is the process of new layers or parts being added to something so that it increases in size. [FORMAL]

The larger the animal, the greater the accretion of poison in the fat.

English dictionary. 2008.

(by accession of parts), , / , / (of soil, as at the mouth of a river)

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