Dictionary and Thesaurus

Definition of At Once

• (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!"
• (adverb) simultaneously; "he took three cookies at a time"

Synonyms of At Once

• Immediately
• Instantly
• Straightaway
• Straight Off
• Directly
• Now
• Right Away
• Forthwith
• Like A Shot
• At A Time
• At One Time

Antonyms of At Once

Homophones of At Once