This is the 2595th most frequent Turkish word.
sorusu
"Sorusu" means "his/her/its question" or "the question of."
In this sentence, 'sorusu' is used as 'question (possessive form)', indicating belonging or relevance to a specific subject or entity.
Bu sorusu çok önemli bir konuda ilerleme sağladı.
This question contributed significantly to progress on an important matter.
Here, 'sorusu' implies a specific question contained in the aforementioned book.
Kitapta yer alan sorusu çok düşündürücüydü.
The question in the book was very thought-provoking.
In this sentence, 'sorusu' refers to a particular inquiry presumably from someone or about something.