<p><strong>Noun:</strong></p><ul><li>an increase by natural growth or by gradual external addition; growth in size or extent</li><li>the result of this process</li><li>an added part; addition: The last part of the legend is a later accretion</li><li>the growing together of separate parts into a single whole</li><li>Law: increase of property by gradual natural additions, as of land by alluvion</li></ul>