Perusteisen

Perusteisen is a Finnish adjective derived from the noun peruste, meaning foundation or basis. The form perusteisen is the inflected variant often used before a noun in genitive or in other contexts requiring that specific case. The base adjective perusteinen describes something that is founded on a basis or is fundamental, essential, or base-level.

Usage and examples

Perusteisen can be used to describe concepts, data, methods, or arguments that are considered to have a solid base. For example, phrases such as perusteisen tiedon hankkiminen (the gathering of basic information) or perusteisen koulutuksen kehittäminen (the development of basic education) illustrate its application in formal Finnish. In many contexts, perusteinen is used where the emphasis is on the existence of a foundation rather than on thoroughness.

Relation to related terms

Perusteinen is closely related to perusteellinen, an adjective more commonly used to express thoroughness, depth, or substantial quality (for example, perusteellinen tutkimus meaning thorough research). While the two forms share a common root, they convey different nuances: perusteinen leans toward being based on a foundation, whereas perusteellinen emphasizes completeness or depth. Other related terms include perustavaa laatua olevaa or keskeinen to indicate central or essential significance.

Grammar notes

Perusteisen is one representative inflection of the adjective; Finnish adjectives agree with the noun they modify in number and case. In practice, other inflected forms appear as needed to match the noun’s case, number, and determiner. The noun form perusteet and related compounds are used in broader discussions of basis or foundation, while perusteinen concentrates on the quality of being foundational.

See also

Peruste, Perusteellinen, Perusopetus.