accretionəˈkri ʃən
accretion (n)
- plural
- accretions
English Definitions:
accretion, accumulation (noun)
an increase by natural growth or addition
accretion (noun)
something contributing to growth or increase
"he scraped away the accretions of paint"; "the central city surrounded by recent accretions"
accretion (noun)
(astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases
accretion (noun)
(biology) growth by addition as by the adhesion of parts or particles
accretion (noun)
(geology) an increase in land resulting from alluvial deposits or waterborne sediment
accretion (noun)
(law) an increase in a beneficiary's share in an estate (as when a co-beneficiary dies or fails to meet some condition or rejects the inheritance)
accretion (Noun)
The act of increasing by natural growth; especially the increase of organic bodies by the internal accession of parts; organic growth.
accretion (Noun)
The act of increasing, or the matter added, by an accession of parts externally; an extraneous addition; as, an accretion of earth.
accretion (Noun)
Something added externally to promote growth the external growth of an item.
accretion (Noun)
concretion; coherence of separate particles; as, the accretion of particles so as to form a solid mass.
accretion (Noun)
A growing together of parts naturally separate, as of the fingers or toes.
accretion (Noun)
The gradual increase of land by deposition of water-borne sediment.
accretion (Noun)
The adhering of property to something else, by which the owner of one thing becomes possessed of a right to another; generally, gain of land by the washing up of sand or sail from the sea or a river, or by a gradual recession of the water from the usual watermark.
accretion (Noun)
Gain to an heir or legatee, failure of a coheir to the same succession, or a co-legatee of the same thing, to take his share.
Accretion
In astrophysics, the term accretion is used for at least two distinct processes. The first and most common is the growth of a massive object by gravitationally attracting more matter, typically gaseous matter in an accretion disk. Accretion disks are common around smaller stars or stellar remnants in a close binary or black holes in the centers of spiral galaxies. Some dynamics in the disk are necessary to allow orbiting gas to lose angular momentum and fall onto the central massive object. Occasionally, this can result in stellar surface fusion. The second process is somewhat analogous to the one in atmospheric science. In the nebular theory, accretion refers to the collision and sticking of cooled microscopic dust and ice particles electrostatically, in protoplanetary disks and gas giant protoplanet systems, eventually leading to planetesimals which gravitationally accrete more small particles and other planetesimals. Use of the term accretion disk for the protoplanetary disk thus leads to confusion over the planetary accretion process, although in many cases it may well be that both accretion processes are happening simultaneously. T Tauri is an example of this phenomenon.
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