'at one time' definitions:

Definition of 'at one time'

(from WordNet)
adverb
Simultaneously; "he took three cookies at a time" [syn: at a time, at once, at one time]
adverb
At a previous time; "at one time he loved her"; "her erstwhile writing"; "she was a dancer once"; [syn: once, formerly, at one time, erstwhile, erst]