Definitions for one time
erstwhile(a), former(a), old, onetime(a), one-time(a), quondam(a), sometime(a)(adverb)
belonging to some prior time
"erstwhile friend"; "our former glory"; "the once capital of the state"; "her quondam lover"
once, one time, in one case(adverb)
on one occasion
"once I ran into her"