piirkondliku
Piirkondliku is the genitive singular form of the Estonian adjective piirkondlik, meaning regional or pertaining to a region. It is not a standalone noun, but a grammatical inflection used to modify another noun within a noun phrase.
In Estonian, adjectives agree with the noun they modify in case and number. The form piirkondliku appears
Examples of usage include phrases like piirkondliku arengu strateegia (a regional development strategy), piirkondliku arengu kava
Etymology and grammar notes: piirkondliku is formed from the base piirkondlik with the genitive singular suffix,
See also: piirkondlik, Estonian grammar, regional terminology.