What does the word alas mean?

Usage examples for alas

  1. But without eyes, alas! – The Works of John Bunyan Volume 3 by John Bunyan
  2. He was angry with her in that she could endure to see him; but, alas! – The Bertrams by Anthony Trollope
  3. Well hoped we then to meet on this fair shore, Whom Heaven, alas! – The Odyssey of Homer by Homer, translated by Alexander Pope