koostuneisiin

Koostuneisiin is a Finnish inflected form of the verb or participle koostua, meaning to consist of or be made up of. Specifically, koostunut is the past participle meaning “composed” or “consisting of,” and koostuneisiin is its illative plural form, used with plural nouns to indicate movement into or toward components that are composed of several parts. In practice, koostuneisiin functions as an adjective-like modifier describing a noun that is composed of multiple elements, with the illative plural marking (“into/into the composed parts”) for a plural referent.

Grammatically, koostuneisiin shows up in contexts where the speaker refers to something being divided into or considered as parts that are themselves composed of elements. It is most common in formal or technical Finnish, such as scientific, engineering, or analytical writing, where precise description of composition is required. The form is one of several inflected variants of the same participial root, aligning with Finnish case and number systems.

Example usage: Aine jaettiin koostuneisiin osiin. This translates roughly to “The material was divided into the composed parts” or more naturally in English, “The material was divided into constituent parts.”

See also: koostua, koostumus, Finnish past participles and illative forms. While largely confined to written and technical contexts, oikeantapainen use of koosta voi esiintyä myös in discussions of material composition, structure, or system components.