accretion
ac·cre·tion
noun \ə-ˈkrē-shən\Definition of ACCRETION
: the process of growth or enlargement; especially : increase by external addition or accumulation (as by adhesion of external parts or particles)—compare apposition 1, intussusception 2
—ac·cre·tion·ary \-shə-ˌner-ē\ adjective
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