This is the 10183rd most frequent Turkish word.
başrollerini
"Başrollerini" means "its leading roles" or "the leading roles" in English.
Here, 'başrollerini' refers to 'the leading roles' in the movie.
Bu filmin başrollerini ünlü oyuncular paylaşıyor.
The leading roles of this movie are played by famous actors.
In this sentence, 'başrollerini' signifies 'the leading roles' within a TV series context.
Dizinin başrollerini genç yetenekler üstlenmiş.
The leading roles of the series are undertaken by young talents.
Here 'başrollerini' is used possessively to describe the leading roles of the play I am following.