This is the 357th most frequent Turkish word.
önem
Importance.
In this sentence, 'önemi' as the possessive form of 'önem' is used to mean 'importance'.
Bu konunun büyük bir önemi var.
This topic has great importance.
Here, 'önemi' represents the possession of 'importance', showing negation in the sentence.
Senin dediğin şeyin önemi yok.
What you said has no importance.
In this example, 'Önemi olan' specifies something as important.