plecaka

"Plecaka" is the genitive singular form of the Polish noun "plecak," which means "backpack" or "rucksack." As an inflected form, plecaka is used to indicate possession, origin, quantity after certain numerals, or after prepositions that govern the genitive case (for example, "bez plecaka" — "without a backpack," "z plecaka" — "from the backpack," "kolory plecaka" — "the colors of the backpack").

Grammatically, "plecak" is a masculine inanimate noun. Its basic declension in the singular runs plecak (nominative), plecaka (genitive), plecakowi (dative), plecak (accusative), plecakiem (instrumental), plecaku (locative). The plural nominative is plecaki. Recognizing inflected forms like plecaka is important for understanding and producing correct Polish syntax and agreement.

The lemma plecak is common in everyday speech and writing, referring to bags used by students, travelers, and hikers. Etymologically, plecak is transparently related to the Polish root plec- (from plecy, "back") with a nominalizing suffix; plecaka is simply its genitive form used in context. In language processing, lexicography and learning materials, listing such inflected variants helps with comprehension and searchability in inflectional languages like Polish.