#1 accretion n. [accumulation] an increase by natural growth or addition. wn
#2 accretion n. something contributing to growth or increase; "he scraped away the accretions of paint"; "the central city surrounded by recent accretions". wn
#3 accretion n. (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases. wn
#4 accretion n. (biology) growth by addition as by the adhesion of parts or particles. wn
#5 accretion n. (geology) an increase in land resulting from alluvial deposits or waterborne sediment. wn
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