немедленно

1) General subject: amain, at a moment's notice, at short notice, before one could say knife, before you can say knife, before you know where you are, directly, down on the nail, forthwith, immediately, in a tick, in graith, instantly, momentarily, neck and crop (throw him out neck and crop! - гоните его вон!), on the instant, on the nail, on the spot, on the word, proximately, right away, right off, straight, straight away, straight off the ice, straightway, therewith, therewithal, this moment, urgently, with the word, promptly, at the drop of a hat, this minute, outright, on sight

2) Naval: direct, prompt

3) Medicine: state (также используется: 'stat'. АБ), statim, stat

4) Colloquial: in two twos, on the fly, one down!

5) American: in short order

6) French: tout de suite

7) Obsolete: by and by, incontinent

8) Sports: immediate

9) Religion: presently

10) Law: without delay

11) Abbreviation: immed

12) Jargon: INYM

13) Network technologies: on-the-fly

14) EBRD: as soon as possible, asap

15) Makarov: at once, in (one's) tracks, in an instant, incontinently, instantaneously, like a shot, on a short notice