lähtöisiin

Lähtöisiin is a Finnish inflected form that appears as the illative plural of the adjective lähtöinen, meaning “originating” or “initial.” In Finnish grammar the illative case marks motion into something, and for adjectives of the -inen class the plural illative ending is typically -isiin. Therefore, lähtöisiin functions as an adjective phrase that accompanies a plural noun in illative case, used to describe items that are regarded as initial or starting points within a context. The form is most often encountered in linguistic descriptions, dictionaries, or literary texts, and is not common in ordinary everyday speech.

In practice, lähtöisiin is distinguished from related noun-based forms derived from the word lähtö (departure), which appear in different contexts such as travel signage or timetables. The distinction reflects Finnish morphology: lähtöisiin is built on the adjective stem and inflects for illative plural, while the noun-derived forms operate independently with their own case patterns. Because of its specialized nature, lähtöisiin tends to appear mainly in explanations of case endings or in examples illustrating the behavior of -inen adjectives in the illative plural.

See also: Finnish grammar, Illative case, Adjective declension, Finnish vocabulary.