[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.
1605–15; < Latin accrētiōn- (stem of accrētiō), equivalent to accrēt(us), past participle of accrēscere to grow (ac- ac- + crē- grow + -tus past participle suffix) + -iōn- -ion
Related forms
accretive, accretionary, adjective
nonaccretion, noun
nonaccretive, adjective
Example Sentences for accretion
The gradual accretion of knowledge is the way to go.
We have to do, not with the slow processes of growth by deposit or accretion, but with violent and volcanic dislocation.
The material settles around the pulsar's middle in a so-called accretion disk.
The observations focused on atoms of iron in what is called an accretion disk.
The accretion of all this too-perfect detail threatens to tip over into mere glibness.
Planets form from material in this disk, through accretion of smaller particles.
Learning, the accretion of new data in memory, depends on short-term memory.
Most larger moons form from an accretion disk of dust and rocks that swirls around a fledgling planet.
Such particles never reach the event horizon,they are spun off in the polar jets from the accretion disk.
Out there with the accretion disk or someplace, maybe closer.
British Dictionary definitions for accretion
accretion (əˈkriːʃən)
1.  any gradual increase in size, as through growth or external addition
2.  something added, esp extraneously, to cause growth or an increase in size
3.  the growing together of normally separate plant or animal parts
4.  pathol
 a.  abnormal union or growing together of parts; adhesion
 b.  a mass of foreign matter collected in a cavity
5.  law an increase in the share of a beneficiary in an estate, as when a co-beneficiary fails to take his share
6.  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
7.  geology the process in which a continent is enlarged by the tectonic movement and deformation of the earth's crust
[C17: from Latin accretiō increase, from accrēscere. See accrue]

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Word Origin and History for accretion
1610s, from L. accretionem (nom. accretio, gen. accretionis) "a growing larger," from pp. stem of accrescere, from ad- "to" + crescere "grow" (see crescent).
Online Etymology Dictionary, © 2010 Douglas Harper
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accretion in Medicine

accretion ac·cre·tion (ə-krē'shən)

  1. Growth or increase in size by gradual external addition, fusion, or inclusion.

  2. Increase by addition to the periphery of material of the same nature as that already present, as in the growth of crystals. Also called accrementition.

  3. Foreign material, such as plaque or calculus, collecting on the surface of a tooth or in a cavity.

  4. The growing together or adherence of body parts that are normally separate.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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accretion in Science
  1. Geology The gradual extension of land by natural forces, as in the addition of sand to a beach by ocean currents, or the extension of a floodplain through the deposition of sediments by repeated flooding.

  2. Astronomy The accumulation of additional mass in a celestial object by the drawing together of interstellar gas and surrounding objects by gravity.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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