What does wedding plus-one mean? Generally, the phrase "plus-one," most widely used about weddings, allows an invited person to bring someone with them to an event. When engaged couples assign plus-ones, they should remember that the plus-one only applies to some visitors. Invitations with a plus-one, often issued to unmarried guests, allow single attendees to bring a date to the wedding. Inviting a buddy to enjoy the complimentary food and beverages is a closed offer. In...