What does the word pun mean?

Usage examples for pun

  1. A bird in the hand- oh, I'm not making a silly pun about a lark- is worth two in New York! – It Happened in Egypt by C. N. Williamson A. M. Williamson
  2. The Spearmint is called " Mackerel Mint," and in Germany " Lady's Mint," with a pun on the word munze. – Herbal Simples Approved for Modern Uses of Cure by William Thomas Fernie
  3. For twenty pun promised, split between us, he'll travel faster'n Turpin did to York. – Romance by Joseph Conrad and F.M. Hueffer