once (EN)

adverb, conjunction

adverb “once”

1. happens only one time
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   She has visited Paris once in her life.
2. happened in the past
   She once lived in Paris before moving to New York.
3. (in negative statements) at all
   He didn't look up from his book once during the entire meeting.
4. (in mathematics) means a number is multiplied by one
   Once five is five.

conjunction “once”

1. as soon as, when
   Once the rain stops, we can go outside to play.