This is the 2663rd most frequent Polish word.
braci
"Braci" means "brothers" (genitive or locative case) in Polish.
Here, 'braci' is the genitive plural form of 'brat,' used to indicate quantity (two brothers).
Wczoraj widziałem dwóch braci na ulicy.
Yesterday, I saw two brothers on the street.
In this sentence, 'braci' is used in the genitive plural to indicate possession or relation, as in 'from (older) brothers.'
Należy się uczyć od starszych braci.
One should learn from older brothers.
Here, 'braci' is in the genitive plural, employed after the preposition 'dzięki,' which requires genitive case usage.