kuukausiin

Kuukausiin is a Finnish word that functions as the plural illative form of kuukausi, meaning “month.” The illative case marks direction into something or toward a point in time, and in this plural form it refers to entering or reaching a period composed of months, or to a time span measured in months. Because it is the plural illative, kuukausiin is used when the noun kuukausi denotes more than one month.

Morphology: The base noun is kuukausi (month). The nominative plural is kuukaudet, the genitive plural is kuukausien, and the partitive plural is kuukausia. The plural illative is kuukausiin, formed with the illative suffix -iin. The singular illative is kuukauteen.

Usage: Kuukausiin tends to appear in written or formal contexts, especially in discussions of time horizons, schedules, deadlines, or long-running processes. It is most naturally used when describing movement into or toward a time period that spans several months or when framing a time target in a multi-month frame. In everyday language, other constructions are more common, such as expressions using kuukausia or kuukausien aikana to refer to durations or periods within months.

See also: Finnish grammar, cases, illative, time expressions in Finnish.