oppien
Oppien is the genitive plural form of the Finnish noun oppi, which means doctrine, teaching, or principle. The word is used to refer to a set of beliefs or to indicate a relation to those beliefs, rather than to individual lessons. In practice, oppien appears in contexts such as philosophy, religion, and scholarly writing when discussing doctrinal systems or schools of thought. The form reflects Finnish grammar, where the genitive plural suffix -ien is added to stems ending with -i, yielding oppien.
In usage, oppien is often found in phrases meaning “according to the teachings” (oppien mukaan) or when
Related terms include oppi (singular), opillinen (doctrinal), oppineisuus (learnedness), and oppikirja (textbook). In educational contexts, oppiaineet