plus-one

noun
\ˈpləs-ˈwən \

Definition of plus-one 

: a person who accompanies an invited guest to an event or gathering at which guests are allowed to bring a companion or partner My husband twice received handsome engraved invitations to presidential dinners. For those events and many others, I was the perpetual plus-one.— Ana Marie Cox

First Known Use of plus-one

1977, in the meaning defined above

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The first known use of plus-one was in 1977

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