trzeciego

Trzeciego is the genitive singular form of the Polish ordinal adjective trzeci, meaning "the third." It is used when the adjective accompanies a masculine or neuter noun in genitive, or in constructions that require a genitive form. It is not a standalone noun.

In Polish, adjectives decline for gender, number, and case. For the masculine personal and neuter nouns in genitive singular, the form is trzeciego; the feminine genitive singular form is trzeciej. Other cases and other gender combinations have different endings.

Common uses include dating and time expressions and phrases that express order in a sequence. For example, trzeciego lipca means "the third of July." Trzeci, in the corresponding nominative form, would modify a noun directly as "trzydziesty"?—but when the noun is in genitive, trzeciego is used, as in trzeciego dnia meaning "on the third day." The form also appears in longer genitive phrases such as z trzeciego miejsca (from the third place) or w trzeciego roku when the surrounding grammar requires genitive, though such constructions depend on the governing noun and preposition.

Etymology and related forms: trzeciego derives from the base trzeci, which comes from Proto-Slavic roots and has cognates in other Slavic languages, such as Russian tretiy (третий) and Czech třetí. The form illustrates how Polish adjectives adapt across cases to express order, time, and date while remaining linked to a common semantic core.

See also: the base adjective trzeci and other ordinal forms in Polish, as well as general Polish noun–adjective agreement rules and date expressions.