istuimessa
Istuimessa is a Finnish noun form meaning “in the seat.” It represents the inessive case of istuin, which refers to a seat or chair. The expression literally translates to being located in a seat and is used to indicate where a person or object sits or is placed. In everyday speech Finns more commonly describe the act of sitting with verbs such as istuu or olla istunut, but istuimessa appears in contexts where the seat itself or the location within a seating arrangement is the focus, for example in floor plans, furniture catalogs, or signage describing reserved seats.
Morphology and related forms: Istuin is the noun for a seat or bench. The inessive suffix -ssa/-ssä
Usage considerations: Istuimessa is primarily a descriptive or locational marker rather than a common verb-based expression
See also: istuin, tuoli, istua, inessive case (Finnish grammar).