reijän

Reijän is the genitive singular form of the Finnish noun reikä, which means a hole. In everyday and technical language, reijän is used to indicate a relationship to a hole, such as ownership, association, or specification of a particular hole.

In practice, reijän appears in measurements and descriptions of objects with holes. Common phrases include reijän halkaisija (the diameter of the hole) and reijän syvyys (the depth of the hole). Although reijän is a case form rather than a standalone lexical item, it is routinely encountered in engineering, carpentry, architecture, and manufacturing texts to express hole-related attributes.

Etymology and related forms: reikä is the base noun meaning hole, and reijän is its genitive singular form. This is part of standard Finnish noun inflection, where the genitive singular marks possession or association with the noun's referent. The occurrence of reijän is thus a grammatical feature of Finnish rather than a separate concept.

See also: reikä, hole, drilling, mechanical drawing, technical vocabulary in Finnish.

Overall, reijän functions as a grammatical form used in Finnish to describe or qualify holes, especially in technical and descriptive contexts. It does not denote a separate concept on its own but serves to link a hole to its measurements, characteristics, or relationships within a sentence.