at once

Adverb
  1. Without delay or hesitation;
    With no time intervening (synset 400049277)
    "he answered immediately"; "found an answer straightaway"; "an official accused of dishonesty should be suspended forthwith"; "Come here now!"
    same as: directly, forthwith, immediately, instantly, like a shot, now, right away, straight off, straightaway
  2. Simultaneously (synset 400154319)
    "he took three cookies at a time"
    same as: at a time, at one time

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