This is the 7491st most frequent Russian word.
департаменту
The Russian word "департаменту" means "to the department" in English.
In this sentence, 'департаменту' is used in the dative case to indicate the indirect object receiving the action, which is the department.
Я отправил письмо департаменту.
I sent a letter to the department.
Here, 'департаменту' is in the dative case, showing a possession or association with the department.
Принадлежность здания департаменту была неоспорима.
The building's ownership by the department was indisputable.
In this case, 'департаменту' is again in the dative case, used to signify the recipient of the report.