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Definition of once:

  1. At any one time; - often nearly equivalent to ever, if ever, or whenever; as, once kindled, it may not be quenched.
  2. At some one period of time; - used indefinitely.
  3. By limitation to the number one; for one time; not twice nor any number of times more than one.


previously, previously, aforetime, twice, beforetime, formerly, at a time, once only, in one case, at once, uniquely, erst, one time, at one time, before, earlier, precede, erstwhile, already, one, earlier.

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