übermorgen
the day after tomorrow
Refers to the day that follows tomorrow; the second day after today.
Wir treffen uns nicht morgen, sondern erst übermorgen.
We're not meeting tomorrow, but only the day after tomorrow.

the day after tomorrow
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the day after tomorrow
Refers to the day that follows tomorrow; the second day after today.
Wir treffen uns nicht morgen, sondern erst übermorgen.
We're not meeting tomorrow, but only the day after tomorrow.

The word is made up of 'über' and 'morgen' (tomorrow). The prefix 'über' here means 'beyond' or 'after'. So 'Übermorgen' is literally the day 'after tomorrow'.
Die Prüfung ist nicht morgen, sondern erst übermorgen.
The exam is not tomorrow, but only the day after tomorrow.
As a time adverb, 'übermorgen' can stand in position 1, in which case the verb follows directly after it. But it can also stand after the verb and the subject in the middle of the sentence.
Übermorgen beginnt mein Urlaub.
The day after tomorrow, my vacation begins.
'Übermorgen' is part of a logical series of time adverbs that refer to 'heute' (today): the order is vorgestern, gestern, heute, morgen, übermorgen (the day before yesterday, yesterday, today, tomorrow, the day after tomorrow).
Gestern war ich krank, morgen habe ich einen Termin und übermorgen kann ich endlich ausschlafen.
Yesterday I was sick, tomorrow I have an appointment, and the day after tomorrow I can finally sleep in.
today
'heute' and 'übermorgen' are both time adverbs, but they point to different days. 'heute' means the current day. 'übermorgen' means the day after tomorrow, that is, two days after today. The words can be confused when making plans because both are calculated from the current situation. Remember: 'heute' is now, 'morgen' is one day later, and 'übermorgen' is two days later.

Übermorgen kommt der Gast in der Pause kurz ins Büro.
The day after tomorrow, the guest will briefly come to the office during the break.
Am Telefon klären wir heute den Termin mit einem Freund.
On the phone, we are sorting out the appointment with a friend today.