This is the 15737th most frequent Polish word.
sześciorga
"Sześciorga" means "of six people" (used in the genitive case, typically referring to a mixed group).
Here, "sześciorga" specifies a group of six children, a collective numeral used in Polish for non-masculine-personal contexts.
Na spotkaniu było sześciorga dzieci.
There were six children at the meeting.
"Sześciorga" refers to a group counting six, specifically siblings in this context, showcasing a usage with collective familial terms.
Podarowałem książki dla sześciorga rodzeństwa.
I gave books to six siblings.
The numeral "sześciorga" indicates a group of participants measured collectively, applied here in a formal context.