Kääntyviin

Kääntyviin is a Finnish grammatical form derived from the adjective or present participle kääntyvä, meaning turning or rotating. In Finnish, kääntyviin functions as an illative plural form that is used to describe objects or components that are capable of turning or rotating and that are referenced in the illative case (toward or into). The form commonly appears in technical or descriptive texts where multiple rotatable items are discussed.

Morphology and usage follow standard Finnish inflection patterns for adjectives and participles used in illative plural. The base stem kääntyv- combines with the plural illative suffix -iin to yield kääntyviin. This form typically modifies a plural noun in the illative, for example as part of phrases describing where a group of rotating components is directed or installed. Common contexts include machinery, equipment, furniture, and robotics where rotatable parts are relevant. Examples include kääntyviin osiin (into turning parts) and kääntyviin laitteisiin (into rotatable devices).

In practice, kääntyviin is most often encountered in technical writing, product descriptions, installation guides, and academic texts that discuss mechanisms with rotational joints or adjustable positions. It is less common in everyday conversation, where simpler adjectives or participle forms are usually sufficient. The term helps specify the characteristic of being rotatable when multiple items are being referred to collectively in the illative case.

See also: Finnish grammar, participles in Finnish, illative case, adjectives in Finnish.