This is the 38th most frequent Serbian word.
општине
"Општине" means "municipalities" in English.
The word 'општине' is used in its plural form to refer to 'municipalities', geographical and administrative areas governing local regions.
Општине у Србији организују локалне изборе.
Municipalities in Serbia organize local elections.
Here, 'општина' is in plural form, denoting the regions visited.
Посетио је неколико општина у околини.
He visited several municipalities in the vicinity.
In this case, 'општине' is in genitive singular, indicating possession related to a single municipality.