This is the 2365th most frequent Russian word.
областей
"Областей" means "regions" or "areas" (in the genitive plural form).
The word "областей" refers to the 'areas' or 'fields' in the context of science.
Сеть охватила множество областей науки.
The network covered many areas of science.
Here, "областей" refers to 'regions' or 'administrative areas' in the context of the country.
В различных областях страны развивается туризм.
In various regions of the country, tourism is developing.
In this sentence, "областей" denotes 'fields' or 'domains,' specifically in the context of economics.