interregionaalisiin

Interregionaalisiin is a Finnish adjective form that functions as the illative plural of interregionaalinen, meaning interregional. It is used to describe movement into or involvement with interregional contexts and is typically attached to a noun in the illative plural, such as hankkeisiin, suhteisiin, verkostoihin or yhteistyöhankkeisiin. Therefore common phrases include interregionaalisiin hankkeisiin, interregionaalisiin suhteisiin and interregionaalisiin verkostoihin.

A linguistic note: interregionaalisiin is formed from the loanword interregional with Finnish adjektivization and then declined according to Finnish case and number rules. The illative plural ending -isiin signals motion into or engagement with the plural noun it modifies. In practice, the form appears mainly in policy, regional development and research language, especially when referring to cross-regional cooperation or projects.

Usage context: The term frequently appears in government and European Union discourse, for example in discussions of cross-border or cross-regional activities and funding programs such as INTERREG. It is also used in academic and planning texts to describe activities, relationships or collaborations that span multiple regions.

Examples of meaning in context include participation in interregional projects (interregionaalisiin hankkeisiin osallistuminen) and issues related to interregional relations (interregionaalisiin suhteisiin liittyvät kysymykset). The word helps to specify the scope of action as between multiple regions rather than within a single region.