Accretion
/əˈkriʃən/
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Definition
(noun) Increase by natural growth, especially the gradual increase of organic bodies by the internal addition of matter; organic growth; also, the amount of such growth.
Sentence Examples
An accretion disk has formed around the star.
A mineral ... augments not by growth, but by accretion.
CEFR Practice Quiz
The island was formed by the gradual ____ of volcanic rock.