To gradually grow something from small parts.
A beach is the result of accretion of sand from the ocean.
1. The act of increasing by natural growth; esp. 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; as an accretion of earth.
"A mineral - augments not by grown, but by accretion." Owen.
"To strip off all the subordinate parts of his 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 toes.
(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 sail 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, failure of a coheir to the same succession, or a co- legatee of the same thing, to take his share. Wharton. Kent.