noun
1.
an amount of money that is added to a bill, as an extra charge for a service :
That will be $50, plus a service charge of $2.50.
2.
( BrE ) an amount of money that is added to a bill in a restaurant, for example 10% of the total, that goes to pay for the work of the staff
3.
an amount of money that is paid to the owner of an apartment building for services such as putting out rubbish / garbage, cleaning the stairs, etc.