A person who advocates for the process of decentralization; a strong believer in moving power from central authorities to local ones.
From decentralization plus the suffix -ist. This is a more formal version of decentralist, emphasizing the specific process of decentralization rather than just the philosophy.
The term 'decentralizationist' is so formal and clunky that almost nobody uses it anymore—people just say 'they support decentralization' instead. It's a word that shows how language sometimes creates fancy terms that everyone agrees are too awkward to actually use!
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