materiaalisiin

materiaalisiin is a Finnish inflected form that functions as the illative plural of the adjective materiaalinen, meaning material or material-related. It is not a standalone lexical entry but a grammatical form used when an adjective describes a plural noun and the speaker intends the illative meaning into those groups or sets. In Finnish, the illative plural suffix for adjectives ending in -inen is typically -isiin, so materiaalinen becomes materiaalisiin in that context.

Morphology and usage: The stem materiaal- combines with the suffix -inen to form materiaalinen (material-related). To express “into the material ones” or “into material groups” with a plural noun, the word declines to materiaalisiin. This form usually appears in descriptive or formal prose, especially when discussing categories, groups, or sets of things described as material-related. The full construction commonly includes a following plural noun, as in materiaalisiin ryhmiin kuuluvat osat or similar phrases.

Examples:

- Esimerkki: tutkimus kohdistuu materiaalisiin ryhmiin kuuluvii osiin. (The study targets parts belonging to material groups.)

- Esimerkki: materiaalisiin resursseihin perustuvia päätöksiä tehtiin. (Decisions were made based on material resources.)

Relation to other forms: materiaalisiin is related to the corresponding singular illative forms (materiaalin), as well as to other case and number forms of matérielinen and materiaali. It contrasts with illative forms of the noun materiaalit (materiaaleihin) or with other adjectives in -inen that can take -isiin in the illative plural. Understanding its use requires attention to the noun it modifies and the illative case the sentence requires.

See also: Finnish grammar, Illative case, Adjective declension, Materiality in language.

---