nimistössä

Nimistössä is a Finnish word formed by adding the inessive case ending -ssä to the noun nimistö. Nimistö generally denotes a set of names, most commonly a system or collection of place names (toponymy) or a specialized nomenclature. The inessive nimistössä therefore means "in the nomenclature" or "within the list of names" and is used to indicate that something exists or is recorded among those names.

In linguistic and administrative contexts nimistössä appears in descriptions of databases, gazetteers and studies of place names: for example, one might say that a particular village name is nimistössä, meaning it is included in the official record. Research on Finnish toponymy (nimistötutkimus) frequently refers to what appears nimistössä when discussing origins, variants, and official standardization. The Institute for the Languages of Finland and local authorities maintain and publish name registers that serve as reference nimistöjä.

Grammatically, nimistössä illustrates Finnish case morphology: the stem nimistö takes -ssä to mark location "in" or "within." Related forms include nimistö (nominative), nimistön (genitive), and nimistöissä (plural inessive). The term is used both in everyday administrative language and in scholarly work on names, history, and cultural heritage.