fonettiseen
Fonettiseen is the illative singular form of the Finnish adjective fonetinen, meaning phonetic. In Finnish grammar, adjectives decline to agree with the noun in case, number, and definiteness. When describing movement toward or into something described as phonetic, the illative singular form fonettiseen is used. This form is typical for adjectives ending in -inen and is part of the broader pattern of Finnish illative endings, such as -iin or -eseen, depending on the stem.
In practice, fonettiseen is found in phrases such as fonettiseen kirjoitukseen (into phonetic writing), fonettiseen muotoon
Etymology: fonettinen derives from the root fonet- connected to phonetics, which itself traces back to the Greek
See also: fonetiikka (phonetics), fonetinen (phonetic as an attributive adjective), Finnish case and adjective inflection patterns.