uczestniczya
Uczestniczya is not a recognized term in standard Polish. It does not appear in major Polish dictionaries as a verb or any other part of speech. In practice, it is generally understood as a misspelling of uczestniczyć, or as a stylized or ad hoc form that appears in informal online texts or as a brand or user handle. Because it is not official, its meaning depends entirely on context.
The canonical Polish verb is uczestniczyć meaning "to participate." It derives from the noun uczestnik ("participant")
Usage and notes: In formal writing, use the standard form uczestniczyć. In casual contexts, readers may interpret