This is the 1601st most frequent Turkish word.
planlanan
"Planned."
Here, 'planlanan' acts as an adjective describing 'toplantının' (the meeting).
Planlanan toplantının saati değiştirildi.
The scheduled meeting's time was changed.
In this sentence, 'planlanan' modifies 'etkinlik' (event) to indicate that it is the event which has been planned.
Planlanan etkinlik için hazırlıklar tamamlandı.
Preparations for the planned event were completed.
'Planlanan' is used to describe 'projeler' (projects), suggesting they are already defined in a plan.