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\ 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
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Time Traveler for plus-one
The first known use of plus-one was in 1977
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