• (America) enPR: ŭkrēshən, IPA: /ə.ˈkɹi.ʃən/


  1. The act of increasing by natural growth; especially the increase of organic bodies by the internal accession of parts; organic growth.
  2. The act of increasing, or the matter added, by an accession of parts externally; an extraneous addition
    an accretion of earth
    A mineral ... augments not by growth, but by accretion.
    • To strip off all the subordinate parts of his as a later accretion
  3. Something added externally to promote growth the external growth of an item.
  4. Concretion; coherence of separate particles
    the accretion of particles so as to form a solid mass
  5. (biology) A growing together of parts naturally separate, as of the fingers or toes.
  6. (geology) The gradual increase of land by deposition of water-borne sediment.
  7. (legal) 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.
  8. (legal) 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 percentage.
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