1. A genuine or concrete failure that has actually occurred, as opposed to a potential or hypothetical one
The actual failure of the system was caused by a software bug.
A falha real do sistema foi causada por um erro de software.
2. In engineering and quality assurance, a defect or malfunction that has demonstrably happened
We need to investigate the actual failure before implementing preventive measures.
Precisamos investigar a falha real antes de implementar medidas preventivas.