This is the 4574th most frequent Turkish word.
başkanını
"Başkanını" means "your president" or "your leader" in English.
Here, 'başkanını' is used as the definite object of the verb 'anı(ıyor)', indicating possession ('n' connector) and accusative case.
Ülkenin başkanını herkes saygıyla anıyor.
The nation's president is respectfully remembered by everyone.
In this sentence, 'başkanını' refers to the president of the school, marked for accusative and showing possession, highlighted by its role in the context of the observation.
Okulun başkanını dün yeni kararlar alırken gördüm.
I saw the school's president making new decisions yesterday.
Here, 'başkanını' implies the leader (president) of the association, functioning as a possessed and definite object within its context.