Webster's English Dictionary

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once

1. once \'w*n(t)s\ av [ME ones, fr. gen. of on one] 1: one time and no more 
    2: at any one time : under any circumstances : EVER  3: at some indefinite 
   time in the past : FORMERLY  4: by one degree of relationship 
2. once aj : that once was : FORMER 
3. once n : one single time : one time at least  1: at the same time : 
   SIMULTANEOUSLY  2: IMMEDIATELY  - at once 
4. once also once that cj : when once : if once : at the moment when : as 
   soon as