Meaning of the word "at once" in English

What does "at once" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

at once

US /ət wʌns/
UK /ət wʌns/
"at once" picture

Adverb

1.

immediately; without delay

Example:
Please come here at once.
She recognized him at once.
2.

at the same time

Example:
You can't do two things at once.
She was both happy and sad at once.
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