IPA: /ˈriːdʒənəli/
KK: /ˈriːdʒənəli/
In a way that relates to a specific area or part of a country, rather than the whole country or the world.
The festival is celebrated regionally, with different traditions in each area.
Regionally → It is formed from "regio" (from Latin, meaning a direction or area) and the suffix "-ally" (meaning in a manner relating to). The word "regionally" refers to something that pertains to a specific area or region.
Think of 'regio' as relating to a specific 'area' — that's why 'regionally' means in a manner relating to a specific area.