Common loanword used for invited guests at events, TV/radio programs, hotels, and similar contexts. Slightly more formal or event-oriented than お客さん.
A special guest will appear on tonight's program.
結婚式にゲストを何人呼びますか。
How many guests will you invite to the wedding?
Tonight's show will welcome a popular singer as a guest.
She appeared as a guest on the drama.
We invited many guests to the wedding.
This week's guest is a famous film director.
guest member