This is the 2085th most frequent Russian word.
могилевской
Relating to Mogilev, a city or region in Belarus.
The word 'Могилевской' functions as an adjectival form, indicating that the theater is associated with Mogilev, likely being a name derived from the city.
Я посетил Могилевской театр во время моей поездки.
I visited the Mogilev Theater during my trip.
Here, 'могилевской' is used to describe 'province,' showing it pertains to the Mogilev region.
В библиотеке я нашел книгу с историями могилевской провинции.
In the library, I found a book with stories from the Mogilev province.
In this instance, 'могилевской' modifies 'ensemble,' identifying it as associated with the Mogilev area.