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once (EN)
phó từ, liên từ

phó từ “once”

once (more/most)
  1. một lần
    She has visited Paris once in her life.
  2. đã từng
    She once lived in Paris before moving to New York.
  3. bao giờ
    He didn't look up from his book once during the entire meeting.
  4. một lần (trong toán học)
    Once five is five.

liên từ “once”

once
  1. khi
    Once the rain stops, we can go outside to play.