Definition

at once: immediately, right away, this minute, instantly, right now adverb
I want you to start working on this project at once, there isn't a moment to spare.
  • "You don't have to do it all at once."
  • "Pack your things and leave at once."
  • "Bruno : Good, now that you're here, I want you to leave at once."
  • "I have to alert Princess Utopia at once!"
  • "These consumers are likely to own several fragrances at once."
  • "Open this door at once!"
  • "He is very efficient and can do many things at once."

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