plus-one
noun
                                
              
          
                                                      : 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
Ana Marie Cox
                         
                
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  Merriam-Webster unabridged




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