2 definitions found

From WordNet (r) 2.0 [wn]:

accretion

noun

1: an increase by natural growth or addition [syn: {accumulation}]

2: something contributing to growth or increase; "he scraped away the accretions of paint"; "the central city surrounded by recent accretions"

3: (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases

4: (biology) growth by addition as by the adhesion of parts or particles

5: (geology) an increase in land resulting from alluvial deposits or water-borne sediment

6: (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)

From The Collaborative International Dictionary of English v.0.44 [gcide]:

accretion \ac*cre"tion\ ([a^]k*kr[=e]"sh[u^]n), noun [L. accretio, fr. accrescere to increase. Cf. {Crescent}, {Increase}, {Accrue}.]

1. The act of increasing by natural growth; esp. the increase of organic bodies by the internal accession of parts; organic growth. --Arbuthnot.

2. The act of increasing, or the matter added, by an accession of parts externally; an extraneous addition; as, an accretion of earth.

A mineral . . . augments not by growth, but by accretion. --Owen.

To strip off all the subordinate parts of his narrative as a later accretion. --Sir G. C. Lewis.

3. Concretion; coherence of separate particles; as, the accretion of particles so as to form a solid mass.

4. A growing together of parts naturally separate, as of the fingers or toes. --Dana.

5. (Law) (a) 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 soil from the sea or a river, or by a gradual recession of the water from the usual watermark. (b) Gain to an heir or legatee, by failure of a coheir to the same succession, or a co-legatee of the same thing, to take his share. --Wharton. Kent.
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