identtiseen

Identtiseen is the illative singular form of the Finnish adjective identtinen, meaning "identical". In Finnish grammar the illative case expresses movement into or direction toward something; when an adjective modifies a noun in that case, the adjective takes the matching illative ending and agrees in number and case with the noun. Thus identtinen becomes identtiseen when used with a singular noun in the illative (for example, identtiseen huoneeseen — "into the identical room").

The form appears in both literal and figurative contexts wherever the notion of sameness or exact correspondence and a directional or into-oriented structure are required. It is a regular morphosyntactic variant produced by Finnish case inflection rules for adjectives ending in -nen. As with other inflected forms, its surface shape depends on vowel harmony and consonant gradation rules that govern Finnish morphology.

Examples:

- He siirtyivät identtiseen huoneeseen. (They moved into an identical room.)

- Mallit ovat identtiseen asuun puettuja. (The models are dressed in identical outfits, into the identical outfit — contextual use may vary.)

Etymologically identtinen is a borrowing of the international adjective "identical" (via European languages), adapted into Finnish phonology and morphology; identtiseen is simply one of its case-inflected forms used in normal syntactic agreement.