• noun:   (law) an increase in a beneficiary's share in an estate (as when a co-beneficiary dies or fails to meet some condition or rejects the inheritance)
• noun:   an increase by natural growth or addition
• noun:   (geology) an increase in land resulting from alluvial deposits or water-borne sediment
• noun:   (biology) growth by addition as by the adhesion of parts or particles
• noun:   (astronomy) the formation of a celestial object by the effect of gravity pulling together surrounding objects and gases
• noun:   something contributing to growth or increase

  Example: "He scraped away the accretions of paint"

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