what does the phrase "at once" mean in this sentence?

[vaok]

what does the phrase "at once" mean in this sentence?

I wish I could be in two places at once.

[Conchita]

'At once' here has the sense of 'at the same time'.

[vaok]

but I can't find the meaning of "at once "in any dictionary?

[lost_soul]

Really in ANY ?

http://www.thefreedictionary.com/at+once
_________________
Alex

A native speaker of Russian

[Mister Micawber]

.
And here are SOME MORE.
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mr. Micawber

[vaok]

thanks a lot!