This is the 3432nd most frequent Turkish word.
liderlerin
"Of the leaders" or "leaders'."
In this context, 'liderlerin' is a possessive form meaning 'of the leaders'.
Liderlerin kararları toplumu etkiliyor.
The leaders' decisions affect the society.
Here, 'liderlerin' refers to the individuals holding leadership roles participating in a discussion.
Toplantıda liderlerin birbirleriyle tartıştığını gördüm.
I saw the leaders arguing with each other in the meeting.
'Liderlerin' here expresses the quality of leaders demonstrating dedication.