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Zeit vs. Uhrzeit vs. Stunde vs. Uhr

Word practice demo
In German, several words relate to the concept of time, but they are not interchangeable. Zeit, Uhrzeit, Stunde, and Uhr each have specific meanings and contexts, which are essential for speaking and understanding German correctly.

Zeit

A1
This is the most general word for time. It refers to time as an abstract concept, a period or duration of time, or a specific era. It is the direct equivalent of the English word time in its broadest sense.
Ich habe leider keine Zeit.
(Unfortunately, I don't have any time.)
Wir hatten eine schöne Zeit im Urlaub.
(We had a wonderful time on vacation.)
Die Zeit heilt alle Wunden.
(Time heals all wounds.)
Es ist Zeit, nach Hause zu gehen.
(It is time to go home.)

Uhrzeit

A2
This word specifically means time of day or the time on a clock. You use it when you are asking for or stating a specific time, like 10:30 AM. It literally translates to clock-time.
Können Sie mir die genaue Uhrzeit sagen?
(Can you tell me the exact time of day?)
Auf der Einladung steht die falsche Uhrzeit.
(The invitation shows the wrong time.)
Die Uhrzeit des Abflugs ist 14:20 Uhr.
(The time of departure is 2:20 PM.)
Wir müssen eine Uhrzeit für das Treffen festlegen.
(We have to set a time for the meeting.)

Stunde

A1
This word means hour. It refers to a unit or duration of time lasting 60 minutes. In a school or university context, it can also mean a lesson or class period.
Der Film dauert ungefähr zwei Stunden.
(The movie lasts for about two hours.)
Ich warte schon seit einer halben Stunde.
(I have been waiting for half an hour.)
Wir haben jetzt eine Stunde Mathematik.
(We have a math lesson now.)
Sie arbeitet acht Stunden pro Tag.
(She works eight hours per day.)

Uhr

A1
This word has two main meanings. First, it refers to the physical object: a clock or a watch. Second, it is used when telling the time to mean 'o'clock'.
Meine neue Uhr war sehr teuer.
(My new watch was very expensive.)
An der Wand hängt eine große Uhr.
(A large clock is hanging on the wall.)
Es ist genau vier Uhr.
(It is exactly four o'clock.)
Der Zug fährt um 17 Uhr ab.
(The train departs at 5 PM.)

Summary

To summarize: use Zeit for time as a general concept. Use Uhrzeit for the specific time on a clock (e.g., 10:30). Use Stunde for a duration of 60 minutes, an hour. Use Uhr for the physical clock or watch, or as 'o'clock' when telling the time (e.g., 2 Uhr).