kuukausien

Kuukausien is the genitive plural form of the Finnish noun kuukausi, meaning "months." It is used to express possession, association, or measurement involving more than one month. In Finnish grammar, kuukausien marks a relationship to multiple months, for example in phrases like “months’ differences” or “during the months.”

Morphology and related forms: The genitive plural of kuukausi is kuukausien. This form is built from the base kuukausi with the standard genitive plural suffix -ien. By comparison, the genitive singular is kuukausen, the nominative plural is kuukaudet, and the partitive plural is kuukausia. These related forms are commonly used to express different numerical and syntactic constructions involving months.

Usage and examples: Kuukausien is frequently seen in noun phrases that describe features or periods spanning several months, such as "kuukausien vaihtelu" (the variation across the months) or "kuukausien summat" (the sums of the months). It also appears in temporal expressions like "kuukausien aikana" (during the months) to indicate a timeframe that covers multiple calendar months. When a specific count of months is mentioned, the genitive singular is typically used after numbers, e.g., "kolmen kuukauden aikana" (during the three months), rather than the genitive plural.

Notes: Kuukausien serves as a standard grammatical tool for indicating multi-month relationships in Finnish. Its correct usage depends on whether the context requires a plural genitive to denote a possessive or associative relationship with multiple months.