At-once Definition

adverb

(idiomatic) At the same time; simultaneously.

Can you pat your head and rub your belly at once? He tried to eat four cookies at once.
Wiktionary

(idiomatic) Immediately; now; right away.

Tell the doctor to come at once. She is having a baby.
Wiktionary

Origin of At-once

  • From at + once.

    From Wiktionary

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