OTCi

Otci is a grammatical form of the Czech noun otec, which means father. In Czech, otci can function as the dative singular (to the father) and as the locative singular after the preposition o, meaning “about the father.” For example, poslal jsem dopis otci (I sent a letter to the father) and mluvím o otci (I am talking about the father). It is not a standalone lexical item but a case form used to indicate grammatical roles in sentences.

Etymology and relatives: the word otec derives from the Proto-Slavic root *otьcь, related to the concept of father across Slavic languages. In modern Czech, other case forms of the noun include nominative otec, genitive otce, accusative otce, vocative otče, and plural forms such as otcové (nominative), otcům (dative), otcích (locative). The specific form otci appears in limited grammatical contexts as described above.

Usage notes: otci is appropriate in contexts requiring a direct reference to a specific father in indirect objects or after the preposition o. Because it is a morphological form, its meaning depends on the surrounding structure rather than on an independent sense of the word. Outside of Czech, similar words in other Slavic languages exist but usually differ in spelling and case endings.

See also: Czech grammar, otec (father), Czech noun declension, Slavic etymology.