This is the 10250th most frequent Turkish word.
belirledikleri
"Belirledikleri" means "what they have determined" or "what they have specified."
Here, the word 'belirledikleri' means 'they determined' and functions as a relative clause describing 'konuyu' (the topic).
Öğrenciler, grup çalışması için belirledikleri konuyu öğretmene sundular.
The students presented the topic they determined for the group work to the teacher.
In this sentence, 'belirledikleri' means 'they determined' and refers to 'değerler' (values) as a relative clause providing qualification.
Toplum, geleceğini şekillendirmek için belirledikleri değerler üzerine hareket eder.
The society acts based on the values they determined to shape their future.
Here, 'belirledikleri' functions to qualify 'adaylar' (candidates), indicating that these are the ones determined by them.