[uh-kree-shuh n] /əˈkri ʃən/

an increase by natural growth or by gradual external addition; growth in size or extent.
the result of this process.
an added part; addition:
The last part of the legend is a later accretion.
the growing together of separate parts into a single whole.
Law. increase of property by gradual natural additions, as of land by alluvion.
any gradual increase in size, as through growth or external addition
something added, esp extraneously, to cause growth or an increase in size
the growing together of normally separate plant or animal parts

(law) an increase in the share of a beneficiary in an estate, as when a co-beneficiary fails to take his share
(astronomy) the process in which matter under the influence of gravity is attracted to and increases the mass of a celestial body. The matter usually forms an accretion disc around the accreting object
(geology) the process in which a continent is enlarged by the tectonic movement and deformation of the earth’s crust

1610s, from Latin accretionem (nominative accretio) “an increasing, a growing larger” (e.g. of the waxing moon), noun of action from past participle stem of accrescere, from ad- “to” (see ad-) + crescere “grow” (see crescent).

accretion ac·cre·tion (ə-krē’shən)



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