An example of vigilance is when a security guard is always on alert, waiting and watching for something to happen.
The citizens organized a " vigilance committee " and hanged many of the outlaws.
This state of affairs did not escape the vigilance of Nebuchadrezzar.
Vigilance and extra hot fires will have to be kept up when the thermometer falls to 34° or 35° in the parlour or conservatory.
An attempted attack on Antwerp was foiled by the vigilance of the Cardinal Infant.
Marriage required vigilance and maintenance.