This is the 105th most frequent German word.
freitag
"Freitag" means "Friday" in English.
In this sentence, 'Freitag' serves as the subject noun referring to the day.
Freitag ist mein Lieblingstag.
Friday is my favorite day.
Here, 'Freitag' is used in a time-related prepositional phrase, implying a deadline or time point.
Bis Freitag!
See you by Friday!
Here, 'Freitag' is used as a proper noun indicating the specific day of the week, Friday.