This is the 12190th most frequent Turkish word.
güvenilirliğini
"Dependability" or "reliability."
Here, 'güvenilirliğini' functions similarly in the accusative case, specifying the reliability or credibility of the book as the object of the action described by the verb 'doğrulamak' (to verify).
Kitabın güvenilirliğini doğrulamak için araştırma yaptık.
We conducted research to verify the credibility of the book.
The term 'güvenilirliğini' in this sentence refers to the concept of reliability related to scientific studies. Again, it appears in the accusative case, indicating it as the focus of the enhancement described.
Bilimsel çalışmaların güvenilirliğini artırmak için daha fazla veri topluyorlar.
They are collecting more data to enhance the reliability of scientific studies.
In this sentence, 'güvenilirliğini' is used as a noun derived from 'güvenilir' (reliable), referring to the concept or state of reliability. It is used in the accusative case to indicate that it is the object of the verb 'sorguluyorlar' (they are questioning).