
abgeschlossen
completed
Ended, finished, or completed.
Nach fünf Jahren hat sie ihr Medizinstudium erfolgreich abgeschlossen.
After five years, she successfully completed her medical studies.
completed / locked
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completed
Ended, finished, or completed.
Nach fünf Jahren hat sie ihr Medizinstudium erfolgreich abgeschlossen.
After five years, she successfully completed her medical studies.

locked
Secured with a lock or bolt so that one cannot enter.
Bitte prüfe, ob die Haustür abgeschlossen ist.
Please check whether the front door is locked.

self-contained
Spatially separated and existing independently, often in the context of apartments or parts of buildings.
Wir vermieten eine kleine, abgeschlossene Einliegerwohnung mit eigenem Bad.
We are renting out a small, self-contained in-law apartment with its own bathroom.

secluded
Isolated, lonely, or living on one's own, with little contact with the outside world.
Der alte Künstler lebte sehr abgeschlossen in seinem Haus am See.
The old artist lived very secluded in his house by the lake.
'Abgeschlossen' (completed/locked) is the past participle of the separable verb 'abschließen' (to complete/to lock). The meanings of the adjective are derived from the meanings of the verb: to finish something, to lock something, or to separate something off.
Ein abgeschlossenes Kapitel meines Lebens liegt nun hinter mir.
A completed chapter of my life is now behind me.
In the meaning 'beendet' (finished), 'abgeschlossen' (completed) is often used for processes with a clear end, such as 'ein abgeschlossenes Studium' (completed university studies), 'eine abgeschlossene Ausbildung' (completed vocational training), or 'ein abgeschlossenes Projekt' (a completed project).
Für diesen Job benötigen Sie eine abgeschlossene Berufsausbildung.
For this job, you need completed vocational training.
This meaning always refers to physical objects that can be locked. One speaks of an 'abgeschlossene Tür' (locked door), an 'abgeschlossenes Fenster' (locked window), or an 'abgeschlossenes Auto' (locked car).
Bewahren Sie Ihre Wertsachen in einem abgeschlossenen Schrank auf.
Keep your valuables in a locked cabinet.
In the context of real estate, 'abgeschlossen' (self-contained) almost always means 'independent' or 'separate'. An 'abgeschlossene Wohnung' (self-contained apartment) has its own entrance, its own kitchen, and its own bathroom.
Die abgeschlossene Wohnung im Dachgeschoss ist ideal für eine Person.
The self-contained apartment in the attic is ideal for one person.
This meaning describes a person or place that is isolated from the outside world. A typical phrase is 'abgeschlossen leben' (to live secluded).
Seit dem Tod seiner Frau lebt er sehr abgeschlossen und meidet den Kontakt zu anderen.
Since his wife's death, he has lived very secluded and avoids contact with others.
round / about
A story is abgeschlossen (complete) when it has ended. It is described as rund when it also seems complete and coherent as a whole. A story can therefore be abgeschlossen while still having gaps or seeming unsatisfying.

Die Geschichte ist abgeschlossen, obwohl einige Handlungsstränge offenbleiben.
The story is complete, even though some plotlines remain unresolved.
Die Geschichte wirkt rund, weil alle Handlungsstränge sinnvoll zusammengeführt werden.
The story feels complete because all the plotlines are brought together in a meaningful way.