This is the 769th most frequent Serbian word.
чачани
"Чачани" refers to the inhabitants or people from the city of Čačak in Serbia.
This usage of 'чачани' shows it as the plural form of the noun referring to the inhabitants of the city Čačak.
Чачани се увек радо сећају прича из своје историје.
The people of Čačak always fondly remember stories from their history.
Here, 'чачана' represents the genitive plural case of 'чачани', used after the noun group 'група'.
Група чачана је победила на такмичењу певања.
A group of people from Čačak won the singing competition.
In this sentence, 'чачанима' is in the instrumental plural case, showing communication or interaction with the people from Čačak.