This is the 10349th most frequent Turkish word.
bilmek
"Bilmek" means "to know."
In this instance, 'bilmek' is used to describe the act of being aware or informed about someone's feelings.
Onun ne hissettiğini bilmedim.
I did not know what he/she felt.
Here, 'bilmek' is used in its standard form to convey the action of knowing a fact or information.
Ben doğruyu bilmek isterim.
I want to know the truth.
'Bilmek' here signifies familiarity or recognition with the book, something that is well-known or understood.