This is the 3917th most frequent Polish word.
seniora
"Seniora" in Polish refers to a senior woman, an elderly lady, or a female senior citizen.
Here, 'seniora' is in the accusative form, indicating the direct object of the action of meeting.
Spotkaliśmy seniora w parku.
We met a senior in the park.
In this context, 'seniora' denotes the participant in the role of a senior in a competitive or hierarchical setup, typically in sports or games.
Kiedyś byłem seniora na tym turnieju.
I was once a senior at this tournament.
Here, 'seniora' is used in the genitive case to indicate possession—a club belonging to seniors.