piirillä

Piirillä is the adessive singular form of the Finnish noun piiri. As a grammatical case, the adessive (-llä) typically marks location ("at", "on", "by"), possession, the agent with certain verbs, or means/instrument ("by/with") in Finnish. Thus piirillä commonly translates as "at the circle", "in the district", or figuratively "within the group" or "among the ranks of".

The base word piiri denotes a circle, ring, district, circuit, sphere of activity, or an organized group. Piirillä is used in both literal and figurative contexts: for physical location (Piirillä oli monta tehtävää — There were many tasks at the circuit/area), for belonging or influence (Hän toimii poliittisen piirillä — He operates within the political sphere), and to indicate instrumentality or accompaniment in idiomatic expressions.

Morphologically, piirillä is formed from the nominative piiri by adding the adessive suffix -llä and applies to singular reference; corresponding case forms include piirissä (inessive, "in the circle"), piirin (genitive), and piirille (allative, "onto/for the circle"). Use of piirillä is governed by vowel harmony and Finnish consonant gradation rules typical for similar stems.

Common collocations include references to administrative or social domains (kaupungin piirillä, harrastuspiirillä) and idiomatic phrases where "piiri" denotes a sphere of influence, activity, or membership.