once
WordReference English Thesaurus © 2025
Sense: Adverb: on one occasion
Synonyms:
one time, on one occasion, this one time, a single time, only one time, once only
Antonyms:
twice Collocations, several times, many times, repeatedly, frequently Collocations, on several occasions, over and over, again and again, time after time, umpteen times
Sense: Adverb: formerly
Synonyms:
formerly Collocations, previously Collocations, in the past, once upon a time , long ago, onetime, a long time ago
Antonyms:
never Collocations, currently Collocations, current Collocations, presently Collocations, present Collocations, future Collocations, lately Collocations
Sense: Conjunction: when
Synonyms:
when Collocations, as soon as, just as soon as, after Collocations, the moment, the instant, the second, if Collocations, if ever
Antonyms:
before Collocations, after Collocations, later, now Collocations, not yet, soon Collocations, since Collocations, shortly Collocations, instantly
Sense: Adjective: former
Synonyms:
former Collocations, past Collocations, onetime, old Collocations, late Collocations, ex, previous Collocations