Definition of at once
English to English adverb - without delay or hesitation; with no time intervening
He answered immediately.
Found an answer straightaway.
An official accused of dishonesty should be suspended forthwith.
Come here now!.
source: WordNet 3.0 - simultaneously
He took three cookies at a time.
source: WordNet 3.0
Visual Synonyms 
Nearby Word
at once, attonce, atonic, autonomic, adance, atomic, adonic, aidance, atomize, atomise, adience, adonize, attinge, autodynamic, at times, audience, adamance, aidoneus, autotomic, adunc
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