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Adverb: at once
  1. Without delay or hesitation; with no time intervening
    "he answered at once";
    - immediately, instantly, straightaway, straight off, directly, now, right away, forthwith, like a shot [informal], right off the bat [N. Amer, informal], instantaneously, outright, in a flash, tout de suite
     
  2. Simultaneously
    "he took three cookies at once";
    - at a time, at one time

Nearest

at issue
at large
at last
at least
at leisure
at length
at loggerheads
at long last
at most
at odds
at once
at one fell swoop
at one time
at outs
at peace
at present
at random
at rest
at sea
at sign
at sixes and sevens