Main entry: now, directly, immediately, instantly, forthwith, like a shot, straight off, straightaway, at once, right away
Definition: without delay or hesitation; with no time intervening
Usage: he answered immediately; found an answer straightaway; an official accused of dishonesty should be suspended forthwith; Come here now!
Main entry: at a time, at once, at one time
Definition: simultaneously
Usage: he took three cookies at a time