Koostuvien

Koostuvien is a Finnish grammatical form used in noun phrases to express composition or constitution. It is the genitive plural form of the present active participle koostuva, which means “consisting of” or “composed of.” In practice, koosuvien functions as an adjective-like modifier that links to the head noun in genitive plural, signalling that the described items are parts or elements of a larger whole.

Formation and function

The stem koostuv- combines with the standard genitive plural ending -ien to yield koosuvien. This form appears most often in technical, descriptive, or formal writing when enumerating components, ingredients, or materials. For example, phrases such as koosuvien aineksien laatu or koosuvien ainesosien laatu convey “the quality of the constituent ingredients” or “the quality of the components.” The construction can chain with another genitive noun to clarify the relationship between the constituents and the whole.

Usage notes

Koostuvien typically appears in contexts where one wants to attribute properties to the parts that make up something else. It is distinct from general adjectives in its emphasis on composition rather than mere attribute. While common in technical texts, it can also appear in academic or analytical writing discussing mixtures, composites, or systems built from multiple elements.

Examples

- koosuvien ainesosien laatu (the quality of the constituent ingredients)

- koostuvien materiaalien koostumus (the composition of the constituent materials)

See also

koostuva, koostuvuus, genitive plural in Finnish, participles used as adjectives.