Synonyms of once

Adverb

1. once, one time, in one case

usage: on one occasion; "once I ran into her"

2. once

usage: as soon as; "once we are home, we can rest"

3. once, formerly, at one time, erstwhile, erst

usage: at a previous time; "at one time he loved her"; "her erstwhile writing"; "she was a dancer once";

Definition and meaning of once (Dictionary)