alueellisille
alueellisille is a Finnish grammatical form rather than a standalone concept. It is the plural allative form of the adjective alueellinen, meaning regional. In Finnish, adjectives decline to agree with the noun they modify, and when the noun is plural and in the allative case, the adjective takes the corresponding allative plural ending. This results in forms such as alueellisille, which commonly appear in phrases where both the noun and the descriptor are in the allative plural.
The typical use of alueellisille is in noun phrases that indicate recipients, beneficiaries, or targets within
Because alueellisille is a form rather than an independent word, its meaning relies on the accompanying noun
See also: Finnish grammar, allative case, adjectives in Finnish, regional policy terminology.