This is the 742nd most frequent Persian word.
تمدید
Extension or renewal.
The word "تمدید" here refers to the act of extending the validity or duration of something, in this case, a visa.
تمدید ویزای من هنوز تایید نشده است.
The extension of my visa has not yet been approved.
In this sentence, "تمدید" is used to indicate prolonging a previously set deadline.
مدیر شرکت اعلام کرد که مهلت ارسال اسناد تمدید شده است.
The company manager announced that the deadline for submitting documents has been extended.
Here, "تمدید" signifies the act of lengthening the period of an agreement, specifically a work contract.