kuusikulmakoiseen

Kuusikulmakoiseen is a Finnish grammatical form used as the illative singular of the adjective kuusikulmainen (hexagonal) when describing a noun in the illative case. It signals movement into or occurrence within something that has a hexagonal shape or space.

In usage, kuusikulmakoiseen commonly precedes a noun in illative, for example in phrases like kuusikulmakoiseen tilaan, meaning into a hexagonal space, or kuusikulmakoiseen muotoon, meaning into hexagonal form. A sentence such as Mies astui kuusikulmakoiseen tilaan demonstrates how the illative form functions with a noun to express entering a hexagonal environment. The form also appears in contexts describing shapes or structures, especially in technical, architectural, or design-language.

Etymologically, kuusikulmakoinen is built from kuusi (six) and kulma (angle), with the suffix -mainen forming the hexagonal adjective, and kuusikulmio denotes a hexagon. The illative form kuusikulmakoiseen is one of several inflected variants that Finnish adjectives take to agree with their nouns in case and number. While kuusikulmakoiseen is correct in standard Finnish, its use is more common in descriptive or specialized texts than in everyday speech.

Related terms include kuusikulmio (hexagon) and kuusikulmainen (hexagonal). The term kuusikulmakoiseen thus sits within the broader vocabulary for geometric shapes in Finnish and is part of the ordinary inflection system for adjectives describing form or space.