This is the 246th most frequent Turkish word.
itibaren
"Starting from" or "as of."
Here, "itibaren" denotes the starting point in time, indicating when something begins.
Bu kurs Pazartesi itibaren başlayacak.
This course will start from Monday.
"İtibaren" is used to signify the temporal beginning of a regulation's implementation.
Yeni düzenlemeler bugünden itibaren geçerli olacak.
The new regulations will be effective starting from today.
In this sentence, "itibaren" marks a specific date from which an action or state is considered to have begun.