gratuity
noun [ C ]
COMMERCE uk/ɡrəˈtjuːəti/ usplural gratuitiesan amount of money given by a customer to someone who has provided a service, especially in a hotel or restaurant:
Many customers leave a gratuity even if the service has been bad.
The bill came to $200 plus a 15% gratuity.
See also
tip
an amount of money given to someone who has done something special for you :
I would never take a gratuity of any kind from anyone when doing business.
Officers were charged with accepting illegal gratuities.
an amount of money given to an employee who leaves a job:
a terminal/retirement gratuity
He left with an ill-health gratuity payment from the company.