This is the 14735th most frequent Turkish word.
reddetmesinin
"The act of his/her/its refusing."
The word "reddetmesinin" here functions as a noun formed from the verb "reddetmek" (to refuse/reject) and implies possession and causality, providing detail about the action being discussed, which is his refusal.
Onun önerisini reddetmesinin sebebi çok mantıklıydı.
The reason for his refusal of the suggestion was very logical.
In this sentence, "reddetmesinin" describes the act of rejecting the project, indicating possession and timing, showing a subsequent action stemming from the refusal.
Projeyi reddetmesinin ardından yeni bir inceleme başlatıldı.
Following his refusal of the project, a new review was initiated.
Here, "reddetmesinin" points to the specific refusal of the offer, embedding it within a broader sentence construction to indicate possession and explanation.