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.

'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.
completed / locked
'abgeschlossen' and 'abgebrochen' can both say that something is no longer continuing. The important difference is the reason and the result. 'abgeschlossen' means: something was done through to the planned end and is finished. 'abgebrochen' means: something was stopped before the planned end. Learners may confuse the words because both have to do with an ending. Remember: an 'abgeschlossener Kurs' (completed course) has been successfully finished; an 'abgebrochener Kurs' (abandoned course) was ended early.

Sie hat die Ausbildung nach einem Jahr abgebrochen.
She dropped out of the training program after one year.
Im Kurs hat er das letzte Modul erfolgreich abgeschlossen.
In the course, he successfully completed the final module.