This is the 15485th most frequent Turkish word.
takvimine
"Takvimine" means "to his/her/its calendar" in English.
Here, 'takvimine' denotes possession ('his calendar'), functioning as the destination for the writing action.
Gelecek ayın etkinliklerini takvimine yazdı.
He wrote next month's events into his calendar.
Here, 'takvimine' is used to indicate possession ('your calendar') and serves as the object of the verb 'eklemen' (to add).
Bugünkü toplantıyı takvimine eklemen gerekiyor.
You need to add today's meeting to your calendar.
In this sentence, 'takvimine' again indicates possession ('his calendar') and is used as the context for the action of checking appointments.