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Definition of At once
1. Adverb. Without delay or hesitation; with no time intervening. "Come here now!"
Exact synonyms: Directly, Forthwith, Immediately, Instantly, Like A Shot, Now, Right Away, Straight Off, Straightaway
Partainyms: Immediate
Partainyms: Immediate
2. Adverb. Simultaneously. "He took three cookies at a time"