koniu

Koniu is the locative singular form of the Polish noun koń, meaning "horse." It is used after locative-prepositions to indicate location or topic, most commonly after o to express "about the horse" (o koniu). It can also appear after other prepositions that require the locative, such as na koniu (on the horse) or w koniu (in/at the horse), depending on the context. For example: "Mówiliśmy o koniu" and "Jechałem na koniu."

In plural usage, the locative form differs, with koniach serving as the locative plural of koń. The form koniu thus marks a grammatical case rather than standing as an independent noun. Etymologically, koniu derives from the root koń, the Polish word for horse, and shares cognates with other Slavic languages, such as Russian kon', Czech kůň, Slovak kôň, and Slovenian konj, reflecting a common Proto-Slavic heritage for the word.

Koniu appears primarily in standard Polish as part of inflected speech and writing. It is not a separate lexical item outside its grammatical function, but rather one of several case forms used to construct phrases involving a horse. See also Koń, Polish grammar cases, and Slavic cognates for related terms.