tiiviin

Tiiviin is a Finnish word that functions primarily as the genitive singular form of the adjective tiivi, meaning tight or compact. In Finnish grammar, adjectives used to describe a noun often decline to agree with that noun, and tiiviin appears when the adjective is part of a noun phrase in a genitive construction, indicating a property belonging to or modifying the following noun.

In practice, tiiviin is most visible in technical or descriptive texts where the emphasis is on how closely fitted, dense, or snug a feature is. It commonly appears in phrases describing objects, materials, or designs that are characterized by tight seals, close tolerances, or compact forms. For example, tiiviin rakenteen can convey the idea of a structure that is particularly compact or tightly built, while tiiviin eristyksen might refer to a particularly tight insulation.

Relation to other Finnish forms helps situate tiiviin within the language’s morphology. The root tiivi- underlies related words such as tiivi (dense, tight) and tiivis (compact, close). The form tiiviin demonstrates how adjectives in Finnish enter genitive constructions to express possession or association in descriptive phrases.

See also: Finnish grammar; genitive case; adjectives in Finnish; tiivi- word family.

Note: Tiiviin is a form rather than a standalone lexical item, and its usage depends on the noun it accompanies and the overall syntactic context.