noun (n)

• the process of declining from a higher to a lower level of effective power or vitality or essential quality(noun.process)

  Synonym:
  degeneration
  Antonym:
  development, evolution
  

  source: wordnet30
• the delegation of authority (especially from a central to a regional government)(noun.act)

  Synonym:
  devolvement
  

  source: wordnet30
• The act of rolling down.(noun)

  source: webster1913