What does the word single mean?

Usage examples for single

  1. And so Mr. Penfold is at home, after all; and not to send me a single line. – Foul Play by Charles Reade Dion Boucicault
  2. I've never told a single soul. – The Romantic by May Sinclair
  3. Then to lose them both in a single day! – Cambridge Sketches by Frank Preston Stearns