1. at one time - Adverb
2. at one time - Phrase
simultaneously
at a previous time
Source: WordNethe took three cookies at a time Source: Internet
at one time he loved her Source: Internet
her erstwhile writing Source: Internet
she was a dancer once Source: Internet
About 250,000 men served as regulars or as militiamen for the Revolutionary cause in the eight years of the war, but there were never more than 90,000 men under arms at one time. Source: Internet
21CN is a next-generation network transformation, that, at one time, was due for completion by the end of 2010. Source: Internet