Definitions:
the action of helping or doing work for someone

assistance or advice given to customers during and after the sale of goods

a piece of work done for a client or customer that does not involve manufacturing goods

a system supplying a public need such as transport, communications, or utilities such as electricity and water

a ceremony of religious worship according to a prescribed form

a periodic routine inspection and maintenance of a vehicle or other machine

a set of matching crockery used for serving a particular meal

(in tennis and other racket sports) the action or right of serving to begin play.

the formal delivery of a document such as a writ or summons.

perform routine maintenance or repair work on (a vehicle or machine)

(of a male animal) mate with (a female animal)