
abgebrochen
canceled
Describes an action, process, or project that was ended before the planned end.
Das Fußballspiel wurde wegen des starken Gewitters abgebrochen.
The soccer match was canceled because of the severe thunderstorm.
canceled / broken off
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canceled
Describes an action, process, or project that was ended before the planned end.
Das Fußballspiel wurde wegen des starken Gewitters abgebrochen.
The soccer match was canceled because of the severe thunderstorm.

broken off
Describes an object from which a part has been physically removed by breaking.
Der Griff der Tasse ist abgebrochen und liegt auf dem Boden.
The handle of the cup has broken off and is lying on the floor.

dropout
Refers to a person who did not complete their training, university studies, or apprenticeship.
Er ist ein abgebrochener Medizinstudent und arbeitet jetzt als Taxifahrer.
He is a medical school dropout and now works as a taxi driver.
'Abgebrochen' is the past participle of the separable verb 'abbrechen' (to break off / to cancel). The structure 'ab-ge-brochen' is typical for the participle of separable verbs.
Er hat sein Studium nach zwei Semestern abgebrochen.
He dropped out of his studies after two semesters.
The noun that 'abgebrochen' describes reveals the meaning. If it refers to an event, such as 'Spiel' (game) or 'Gespräch' (conversation), it was ended. If it refers to an object, such as 'Ast' (branch) or 'Griff' (handle), a part is broken. If it refers to education or training, such as 'Studium' (university studies), it was not completed.
Die Verhandlungen wurden ergebnislos abgebrochen.
The negotiations were broken off without results.
In the meaning 'ended early', 'abgebrochen' is often used for processes and events, e.g. 'eine abgebrochene Reise' (a canceled trip), 'ein abgebrochenes Experiment' (an aborted experiment), or 'ein abgebrochener Kontakt' (broken-off contact).
Nach dem Streit herrschte zwischen ihnen nur noch abgebrochener Kontakt.
After the argument, there was only broken-off contact between them.
set / hired
For a project, eingestellt generally means that the work on it is no longer being continued. Abgebrochen more specifically says that the project was ended before its planned completion. Both can apply when something ends prematurely, but only abgebrochen explicitly highlights this timing.

Mitten in der Testphase wurde das Projekt wegen hoher Kosten abgebrochen.
The project was canceled halfway through the testing phase because of high costs.
Nach der Testphase wurde die weitere Arbeit an dem Projekt eingestellt.
After the testing phase, further work on the project was discontinued.