viivoihin

Viivoihin is the illative plural form of the Finnish noun viiva, which means line, stroke, or mark. The form is used to indicate direction toward or into multiple lines, or to refer to actions related to lines as a group.

In Finnish grammar, the illative case expresses movement into or onto something. The plural illative suffix -iin attaches to the stem viiva to produce viivoihin, corresponding to illative singular viivaan. Thus viivoihin marks a relationship with more than one line rather than a single line.

Viivoihin appears primarily in technical or descriptive Finnish, including contexts such as typography, diagramming, cartography, geometry, and data visualization. It can be found in manuals, captions, and instructional texts where actions or references involve multiple lines, grids, or stroke-based elements. The form helps specify that the subject interacts with or is directed toward a set of lines rather than to a single line.

As a grammatical inflection, viivoihin illustrates how Finnish uses case endings to convey spatial relations. It coexists with other forms of viiva, such as viivaan (illative singular), viivojen (genitive plural), and viivoihin versus other plural cases, depending on the syntactic role of the noun in a sentence. Understanding viivoihin thus requires recognizing its function as a plural illative marker tied to the base noun viiva.