adv. phr. 1. In the same moment; together. Let's start the dance again all at one time. Mr. Reed's bills came all at one time and he could not pay them.
Synonym: AT THE SAME TIME 1 . 2. At a certain time in the past; years ago. At one time people thought that Minnesota was not a good place to live. At one time most school teachers were men, but today there are more women than men.