What does the word bonus mean?

Usage examples for bonus

  1. We've paid the freight, and a bonus to yourself, as we promised because it was an awkward job. – The Coast of Adventure by Harold Bindloss
  2. The stock was a bonus, Gretzinger; it cost your parties nothing. – The Iron Furrow by George C. Shedd
  3. Better still, you might like to make yourself an employee and pay yourself a tidy once- off bonus through electronic funds transfer. – Underground by Suelette Dreyfus