at the same time

prepositional phrase3

1. •
   At the same instant.

   • Their departures were at the same time.
   • They departed at the same time.
2. •
   Overlapping or coinciding in duration.

   • I'm working. But at the same time, I'm exercising too.
   • His service as chairman was at the same time as his board membership
3. •
   On the other hand (introducing an opposing viewpoint).