Kieleen
Kieleen is the illative singular form of the Finnish noun kieli, meaning language or tongue. In Finnish grammar, the illative case marks movement toward or into a location or target. When applied to the word kieli, kieleen is used in contexts that describe entering or aiming at a particular language, such as translation or language learning.
Form and related forms: The illative suffix for kieli yields kieleen. Related inflected forms of kieli include
Usage notes: In practical use, kieleen appears in phrases that describe moving toward or selecting a language
See also: Finnish grammar, illative case, noun kieli, list of Finnish cases.