At once Meaning, Definition & Usage
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adverb without delay or hesitation; with no time intervening
straightaway; forthwith; like a shot; straight off; directly; right away; immediately; now; instantly.
- he answered immediately
- found an answer straightaway
- an official accused of dishonesty should be suspended forthwith
- Come here now!
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adverb simultaneously
at a time; at one time.
- he took three cookies at a time
WordNet
Definitions
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(a) At the same point of time; immediately; without delay . "Stand not upon the order of your going, but go at once." Shak. "I . . . withdrew at once and altogether." Jeffrey.(b) At one and the same time; simultaneously; in one body;as, they all moved .at once