at one time

Prepositional phrase

1. Formerly.
   • At one time, I could walk ten miles in a day, but I can't any longer.
   • But despite its plague of tunnels, the run-in on this route is of unusual interest to the locomotive enthusiast: besides the hordes of self-important saddle-tanks shunting in the extensive yards, there was at one time the chance of seeing those slender little North London engines, with their large...1951 October, R. S. McNaught, “Lines of Approach”, in Railway Magazine, page 704

   Synonyms:

   formerly

2. Simultaneously, at once.
   • A bigamist has two spouses at one time.

   Synonyms:

   in the past, previously, simultaneously, together, at the same time