once meaning

Adverb: once  wúns

1. On one occasion
   "once I ran into her"
   - one time, in one case 
2. As soon as
   "once we are home, we can rest" 
3. At a previous time
   "she was a dancer once"
   - formerly, at one time, erstwhile [archaic], erst [archaic], sometime [archaic]

Encyclopedia: Once

Examples

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1. remember, you have once been deceived.
2. i should like to see him once before i go.
3. the matter is urgent and must be dealt with at once.
4. a strong objection at once occurred to us.
5. we must evacuate those soldiers at once!