säännöllisellä

Säännöllisellä is the adessive singular form of the Finnish adjective säännöllinen, meaning regular, routine, or systematic. It is used to describe a noun in the adessive case to indicate that something is done or occurs according to a regular pattern, timetable, or routine.

In everyday Finnish, säännöllisellä appears in phrases such as “säännöllisellä aikataululla” (on a regular timetable) or “säännöllisellä rytmillä” (with a regular rhythm). It does not stand alone; it must agree with a noun in case and number. The corresponding adverb for frequency or regularity is säännöllisesti, which means regularly.

Grammatical note: in Finnish, adjectives decline for case and number, so the ending changes to reflect position. The adessive form säännöllisellä is used to modify a noun in the adessive case, usually indicating manner, location, or accompaniment, as in the examples above.

Etymology and usage: derived from sääntö meaning rule; related words include säännöllisyys (regularity) and säännöllisesti (adverb). Säännöllinen carries the sense of regular, periodic, or systematic, and säännöllisellä marks the noun phrase as being in a regular context. It should not be confused with the adverb säännöllisesti meaning regularly.