A Devolution

1. A rolling down.
2. A descent, especially one that passes through a series of revolutions, or by succession
3. The transference of a right to a successor, or of a power from one body to another. Devolution - Wikipedia
4. (derogatory) Degeneration (as opposed to evolution). Devolution (biology) - Wikipedia
5. (Britain, government) The transfer of some powers, and the delegation of some functions, from a central sovereign government to local government; eg. from Westminster to Scottish parliament and Welsh assembly.