Decentralization: Decentralization is similar to devolution but focuses on dispersing power and authority from a central government not only to regional governments but also down further levels such as local municipalities or communities.
Federalism: Federalism is a system where power is shared between a national (federal) government and regional (state/provincial) governments. It allows for both levels of government to have separate powers while also cooperating on certain issues.
Regionalism: Regionalism refers to the strong identification and loyalty towards a specific region within a country, often resulting in demands for greater autonomy or independence from the central government.