Synonyms of 'at one time'
▷ See time
1 onceDictionary, previously, formerly
At one time, 400 people lived in the village.
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at the same time
If something happened or was true formerly, it happened or was true in the past.
He had formerly been in the Navy.
Thesaurus for at one time from the Collins English Thesaurus
If you say that something was the case at one time , you mean that it was the case during a particular period in the past .