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1. An additional payment (or other remuneration) to employees as a means of increasing output
   - incentive
    
2. Anything that makes one feel encouraged
   "his approval was an added bonus";
   - fillip, shot in the arm
    
3. A welcome unexpected event

Derived forms: bonuses

Type of: payment, positive stimulus

Part of: incentive program, incentive scheme

Encyclopedia: Bonus, Pennsylvania