perustuksen

Perustuksen is the genitive singular form of the Finnish noun perustus, a word with two broad meanings: the foundation or base of a physical object, and a constitutional framework in political or legal contexts. In everyday Finnish, the most common term for the national constitution is perustuslaki, and its genitive is perustuslain. The form perustuksen thus functions primarily as a possessive form when perustus is used in the sense of a foundation or, less commonly, in a broader, non-technical sense related to a constitutional concept.

In architectural and engineering language, perustuksen is used to indicate something belonging to or concerning the foundation of a structure. Examples include phrases such as perustuksen rakennus (the construction of the foundation), perustuksen korjaus (the repair of the foundation), or perustuksen sijainti (the location of the foundation). These uses reflect the literal sense of a base or underpinnings.

In legal and political writing, perustuslaki is the standard term for the constitution, and the genitive singular form perustuslain is used to indicate possession or relation to the constitution, as in perustuslain muutokset (changes to the constitution) or perustuslain tulkinta (interpretation of the constitution). The form perustuksen is not typically used to refer to the constitution in modern Finnish; it is more likely to appear in contexts where perustus is understood in a non-legal sense or in older texts.

Plural forms follow regular patterns: perustukset for foundations or constitutions, and the genitive plural perustusten. The word derives from perusta, meaning base or support, and has evolved to cover both physical foundations and fundamental legal norms in Finnish.