Waiting on a table; serving at meals — serving food and drinks to guests or performing that role.
宴会で給仕を頼まれたので、配膳や片付けを手伝った。
I was asked to serve at the banquet, so I helped with plating and cleaning up.
古い家では家族全員で給仕を分担していた。
In old households the whole family used to share the serving duties.
結婚式ではプロのスタッフが給仕を担当した。
At the wedding, professional staff took care of the serving.
A waiter/waitress; server — a person who serves food or drinks (also cabin boy, bellboy, page in older usage).
そのレストランの給仕はとても丁寧で、気持ちよく食事ができた。
The restaurant's server was very polite, so we enjoyed our meal.
古い映画には給仕（きゅうじ）役の少年がよく出てくる。
Old films often feature a boy serving as a page or waiter.
給仕に注文を伝えたら、すぐに料理が運ばれてきた。
After telling the server our order, the dishes were brought right away.
An office boy/girl or page — a person who does odd jobs or errands in an office (older usage).
その出版社で若い給仕が便箋や資料の運搬を担当している。
At that publisher, a young office assistant is in charge of carrying stationery and materials.
かつては給仕として会社で働くのがキャリアの入り口だったこともある。
It used to be that working as an office assistant was an entry point into a company career.