This is the 258th most frequent Swedish word.
tisdagen
The Swedish word "tisdagen" means "the Tuesday" in English.
In this sentence, 'tisdagen' specifies that the day being referred to is the specific Tuesday when the speaker studied all day.
Jag studerade hela dagen på tisdagen.
I studied all day on Tuesday.
Here, 'tisdagen' is functioning as a time reference for when the future event (the concert) will occur.
Konserten som jag talade om kommer att äga rum på tisdagen.
The concert I mentioned will take place on Tuesday.
In this context, 'tisdagen' is used to propose moving a discussion or topic to take place on a specific Tuesday.