järjen

Järjen is the genitive singular form of the Finnish noun järki, which means mind, intellect, or reason. In normal usage, järjen marks possession or a relationship between two nouns, and it appears in both everyday phrases and more abstract expressions. Common examples include järjen mukaan, meaning "according to reason," and järjen voima, meaning "the power of reason."

In Finnish, the genitive singular is used to attribute qualities or relations to other nouns (for example "järjen hallinta" = mastery of reason). The form järjen is not used as an independent word; its function is grammatical, linking phrases and indicating possession.

The concept covers rational thought, prudent judgment, and sensible behavior. In philosophical and ethical discourse, järki is often contrasted with emotion or impulse, and järjen is used to discuss rational evaluation.

Be aware of near-homographs such as järvi (lake) and its genitive järven, which are different words with unrelated meanings despite the similarity in spelling.

See also: järki; Finnish grammar; genitive case.