This is the 9646th most frequent Portuguese word.
corrigido
Corrected.
In this sentence, 'corrigido' is used as a past participle of the verb 'corrigir', meaning 'corrected', indicating that an action—correcting—was performed on the work.
O trabalho foi corrigido pelo professor.
The work was corrected by the teacher.
Here, 'corrigido' signifies the action of fixing or improving errors, emphasizing the completeness of the correction action.
Achei que tinha corrigido todos os erros.
I thought I had fixed all the mistakes.
In the given context, 'corrigido' is used as part of a compound verb in the past perfect (pretérito mais-que-perfeito), indicating a prior action of correction. The focus is on the sequence of actions in time.