1. (adverb)once, one time, in one case on one occasion Synonyms: in one case, erstwhile, once, erst, at one time, formerly, one time
2. (adverb)once as soon as Synonyms: in one case, erstwhile, erst, at one time, formerly, one time
3. (adverb)once, formerly, at one time, erstwhile, erst at a previous time Synonyms: at once, erst, at one time, formerly, erstwhile, at a time, one time, in one case, once
Synonyms and Antonyms of once 
