Bonus (noun)

1. An extra payment or benefit given to an employee in addition to their usual wages or salary.
2. A financial bonus given to a customer or client as a reward for their loyalty or business.
3. An extra sum of money added to a contract or agreement.

Origin:

Late 16th century (originally denoting a gift or benefit granted in addition to what is due): from latin, literally "good", from bonum "good".

Examples:

1. The company gave a bonus to its employees at the end of the year.
2. He received a bonus for his work on the project.
3. The bank is offering a bonus to new customers who open an account with them.
4. The sales staff were promised a bonus if they met their targets.
5. The bonus was included in the contract as an incentive for the workers.