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at one time vs once

once vs at one time

at one time and once both are adverbs.

Word NounAdjectiveVerbAdverb
at one time No No No Yes
once No No No Yes
As adverbs, at one time and once are synonyms defined as:
  • at one time and once: at a previous time
Other synonyms of at one time include erst, erstwhile, formerly.
at one time (adverb) once (adverb)
simultaneously on one occasion
at a previous time at a previous time
as soon as
Difference between at one time and once

Words related to "at one time"

Words related to "once"

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