1. : the process of growth or enlargement by a gradual buildup: such as. a. : increase by external addition or accumulation (as by adhesion of external parts or particles) b. : the increase of land by the action of natural forces. 2. : a product of accretion. especially : an extraneous addition. More @Wikipedia
Hover over any link to get a description of the article. Please note that search keywords are sometimes hidden within the full article and don't appear in the description or title.