Okresowej

Okresowej is a grammatical form rather than a standalone lexical item in Polish. It is the feminine singular form of the adjective okresowy (and its feminine base okresowa) used in the genitive, dative, or locative case. In Polish, adjectives agree with the nouns they modify in gender, number, and case, so the ending -owej appears whenever the feminine adjective denotes a feminine noun in those cases.

The form is productive in everyday and technical language. It commonly occurs in phrases describing cyclic, periodic, or scheduled actions or periods related to a feminine noun. For example, in regulatory or administrative contexts you may encounter terms such as kontrola okresowa (periodic inspection) where okresowej appears when the noun is in a dependent case: kontrole okresowej, do okresowej kontroli, w okresowej kontroli. Similarly, phrases like harmonogram kontroli okresowej (schedule of periodic inspections) and for the feminine noun opieka or usługa in genitive or dative contexts can feature okresowej as the describing adjective.

Etymology: okresowej derives from the noun okres (period) plus the adjectival suffixes that form okresowy/okresowa, with -owej as the standard feminine singular ending in genitive, dative, and locative forms.

In usage notes, okresowej does not stand alone; it modifies a feminine noun and must align with the noun’s case. Its presence signals a temporal or periodic characteristic attached to the described noun, a common feature in legal, administrative, and medical Polish prose.

See also: Polish grammar, adjectives, declension, case forms.