pirmosios

Pirmosios is a Lithuanian grammatical form, specifically the feminine genitive singular (and in some contexts other cases) of the ordinal numeral pirmai/ pirmoji, meaning "the first." It is used to modify feminine nouns and to agree with them in gender, number, and case. In standard usage, permeability of case makes it appear in phrases such as "pirmosios dienos" (the first day) or "pirmosios vietos" (the first places), where the accompanying noun is feminine.

The form illustrates Lithuanian’s inflectional system, where numerals and adjectives decline to match the noun they describe. The exact case of "pirmosios" is determined by its syntactic function within a sentence; for example, it may appear in genitive contexts to express possession or quantity, or in other cases when the noun’s role requires it.

Pirmosios is common in everyday language, especially in dates, ordinal descriptions, and formal writing. It is not generally used as a standalone proper noun or geographic name, and there is no widely recognized place or entity officially titled "Pirmosios." When encountered in literature or linguistic discussion, it is typically analyzed as a morphological form rather than a separate word with a fixed meaning beyond "of the first" or "the first" in accord with the feminine noun it accompanies.

See also: pirmas, pirmoji, Lithuanian grammar.