gratuity
US /ɡrəˈtuː.ə.t̬i/
UK /ɡrəˈtuː.ə.t̬i/

1.
2.
a payment made to an employee at the end of a period of employment, especially on retirement, as a recognition of service
:
•
Upon retirement, he received a substantial gratuity from the company.
•
The company offers a generous gratuity package to long-serving employees.