Accretion
Part of speech: noun
Definition: The act of increasing by natural growth; esp. the increase of organic bodies by the internal accession of parts; organic growth. The act of increasing, or the matter added, by an accession of parts externally; an extraneous addition; as, an accretion of earth. concretion; coherence of separate particles; as, the accretion of particles so as to form a solid mass. A growing together of parts naturally separate, as of the fingers or toes. 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. 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.
Accumulation
Part of speech: noun
Definition: The act of accumulating, the state of being accumulated, or that which is accumulated; as, an accumulation of earth, of sand, of evils, of wealth, of honors.The concurrence of several titles to the same proof.The continuous growth of capital by retention of interest or savings.(investment) The action of experienced investors buying an asset from inexperienced investors when the price of the asset is low.