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