What does the word once mean?

Usage examples for once

  1. That's how 'twould be, she told me once. – Six Plays by Florence Henrietta Darwin
  2. Tell him to come to the 'phone at once." – The Story of a Doctor's Telephone--Told by His Wife by Ellen M. Firebaugh
  3. " I was- once," says she. – The House of Torchy by Sewell Ford
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