This is the 7530th most frequent Turkish word.
haftalık
Weekly.
Here, "haftalık" is used as an adjective to describe the magazine, implying that the magazine is published on a weekly basis.
Bu haftalık dergi yeni makalelerle dolu.
This weekly magazine is full of new articles.
In this sentence, "haftalık" is used to measure the duration, meaning 'one week long.'
Bir haftalık tatil için plan yapıyoruz.
We are planning for a one-week vacation.
Here, "haftalık" describes tasks belonging to this week, specifying the time period of the tasks.