at the same time; simultaneously

Always do right. This will gratify some people and astonish the rest.

All in all, I think my hobbies are balanced; they bring some relaxation to my life, and at the same time bring focus to my studies.

To be in love is not the same as loving. You can be in love with a woman and still hate her.

How many jobs can you do at once?

Everyone in the room checked their watches at the same time.