1. The normal, standard, or routine functioning of a system, machine, business, or organization according to established procedures
The factory resumed regular operation after maintenance.
A fábrica retomou a operação regular após a manutenção.
2. Business activity or service that runs continuously under normal conditions without interruption
The airline is back to regular operation following the strike.
A companhia aérea retornou à operação regular após a greve.