This is the 6758th most frequent Turkish word.
başsavcılığından
"From the office of the chief prosecutor."
The word 'başsavcılığından' is used to indicate the origin of the letter, specifically from 'başsavcılık', which means 'Chief Public Prosecutor's Office', with 'dan' denoting 'from'.
Başsavcılığından gelen mektubu hemen okudum.
I immediately read the letter that came from the Chief Public Prosecutor's Office.
Here, 'başsavcılığından' conveys the location or entity reference where the official is associated.
Başsavcılığından bir yetkiliyle görüşmek istiyorum.
I want to speak with an official from the Chief Public Prosecutor's Office.
In this sentence, 'başsavcılığından' is used to describe the origin of the statement, denoting the source of an announcement.