Adverb: instantaneously ,in-stun'tey-nee-us-lee
- Without delay or hesitation; with no time intervening
"he answered instantaneously";
- immediately, instantly, straightaway, straight off, directly, now, right away, at once, forthwith, like a shot [informal], right now, right off the bat [N. Amer, informal], outright, in a flash, tout de suite
See also: then and there