kertaluonteisia
Kertaluonteisia is a Finnish adjective meaning one-off or single-occurrence, used to describe things that happen or are used only once and are not intended to be repeated regularly. The root kerta means time or occurrence, and the suffix -luonteinen denotes “of the nature of.” The form kertaluonteinen is singular; kertaluonteisia is the plural partitive form used when modifying plural nouns (for example, kertaluonteisia kustannuksia, kertaluonteisia tapahtumia).
In practical use, kertaluonteisia describes non-recurring elements in areas such as finance, planning and law. It
Related terms include yksittäinen (single, individual) and ainutkertainen (one-time in the sense of a unique occurrence).