kerrokseen

Kerrokseen is the illative singular form of the Finnish noun kerros, meaning floor, story, or layer. It marks movement into a space defined by a particular floor or layer and is used with verbs of motion to express destination. The illative form is built by adding the suffix -kseen to the stem kerros, yielding kerrokseen.

In architectural contexts, kerrokseen is used to indicate which floor is being entered, such as in sentences like Hän meni toiseen kerrokseen, meaning “She went to the other/second floor.” The form can also be used more generally for entering a layer or level in non-architectural contexts, including geological or material layers, though this usage is less common in everyday speech.

Kerrokseen operates within Finnish case morphology. Other common forms of kerros include kerroksen (genitive), kerrosta (partitive), and kerroksessa (inessive). These forms reflect how the word changes to indicate possession, quantity, or location in different grammatical contexts.

Because kerrokseen is a case form rather than a standalone concept, its precise meaning depends on the accompanying noun phrase (for example, talon kerrokseen “into the building’s floor/level”). The word is primarily encountered in standard Finnish and is taught as part of basic noun-case morphology.