Noun. 1. lower mantle-the deeper part of the mantle. layer-a relatively thin sheetlike expanse or region lying over or under another. mantle-the layer of the earth between the crust and the core.1  Facebook.. lower mantle-the deeper part of the mantle. layer-a relatively thin sheetlike expanse or region lying over or under another. mantle-the layer of the earth between the crust and the core.
Constitutional amendment. A constitutional amendment refers to the modification of the constitution of a nation or state. In many jurisdictions the text of the constitution itself is altered; in others the text is not changed, but the amendments change its effect. The method of modification is typically written into the constitution itself.
Definition of amendment. 1a : the process of altering or amending a law or document (such as a consitution) by parliamentary or constitutional procedure rights that were granted by amendment of the Constitutionb : an alteration proposed or effected by this process a constitutional amendment. 2 : the act of amending something : correction.