This is the 253rd most frequent Serbian word.
републици
"Републици" means "republic" in the dative or locative case in Serbian.
The word "републици" is in the dative case, used to indicate location or state of being where "in the republic" is expressed.
Живим у републици која има богату историју.
I live in a republic that has a rich history.
"Републици" here is in the dative case too, used to denote the jurisdiction or subject of the conference.
Учествовао је на конференцији о републици.
He participated in a conference about the republic.
The word "републици" again appears in the dative case, relating to the indirect object where actions take place or target.