Also means
day of the week
Usage Note
Wochentag has two senses: any named day of the week, or a working day as opposed to the weekend. It is masculine: der Wochentag. Ask Welcher Wochentag ist heute? to mean "What day of the week is it?"
Examples
"An welchem Wochentag hast du Geburtstag?"
Natural Translation
On which day of the week is your birthday?
Literal Translation
On which week-day have you birthday?

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