Webster's English Dictionary

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accretion

ac.cre.tion \*-'kre--sh*n\ \-sh*-.ner-e-\ \*-'kre-t-iv\ n [L accretion-, 
   accretio, fr. accretus, pp. of accrescereX 1: the process of growth or 
   enlargement :  1a: increase by external addition or accumulation  1b: the 
   increase of land by the gradual or imperceptible action of natural forces 
   2: a product of accretion; esp : an extraneous addition  3: coherence of 
   separate particles : CONCRETION  - ac.cre.tion.ary aj