plus-one

Or plus one

[pluhs-wuhn]

noun

1. a person who accompanies someone to a party or other event when the invitation allows the invited guest to bring another person.

   I phoned Tom to ask if he would be my plus-one at the gala.

plus-one

noun

1. informal,  a person who accompanies an invited person to a social function

Word History and Origins

Origin of plus-one¹

First recorded in 1970–75