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plus–one

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noun \ˈpləs-ˈwən\

Definition of plus–one

  1. :  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

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First Known Use of plus–one

1977

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