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instantly vs at once

at once vs instantly

instantly and at once both are adverbs.

Word NounAdjectiveVerbAdverb
instantly No No No Yes
at once No No No Yes
As adverbs, instantly and at once are synonyms defined as:
  • instantly and at once: without delay or hesitation; with no time intervening
Other synonyms of instantly include directly, forthwith, immediately, like a shot, now, right away, straight off, straightaway.
instantly (adverb) at once (adverb)
without delay or hesitation; with no time intervening without delay or hesitation; with no time intervening
without any delay simultaneously
Difference between instantly and at once

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