We have put together a list of words that are similar to ACCRETION.

10 Alternative Words Similar to accretion

1 Accumulation Noun      Synonym Words Like Accumulation
2 Addition Noun      Synonym Words Like Addition
3 Gain Noun      Synonym Words Like Gain
4 Growth Noun      Synonym Words Like Growth
5 Increase Noun      Synonym Words Like Increase
6 Increment Noun      Synonym Words Like Increment
7 Deposit Noun      Hyponym Words Like Deposit
8 Deposition Noun      Hyponym Words Like Deposition
9 Buildup Noun      Hyponym Words Like Buildup
10 Backup Noun      Hyponym Words Like Backup

3 examples of accretion

1 an accretion of earth
2 the accretion of particles so as to form a solid mass
3 the central city surrounded by recent accretions

10 definitions of accretion

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.
3 Concretion; coherence of separate particles.
4 A growing together of parts naturally separate, as of the fingers or toes.
5 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.
6 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.
7 something contributing to growth or increase
8 (biology) growth by addition as by the adhesion of parts or particles
9 (geology) an increase in land resulting from alluvial deposits or waterborne sediment
10 (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases
We get our data from many different dictionaries across the web:
Wordnik, Wiktionary, Century, American Heritage, Gcide