plus-one

World English Dictionary
plus-one
 
n
informal a person who accompanies an invited person to a social function

Collins English Dictionary - Complete & Unabridged 10th Edition
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Main Entry:  plus-one
Part of Speech:  n
Definition:  the guest of a person invited to an event
Example:  I will be attending the holiday party plus-one.
Etymology:  1977
Usage:  also plus-one, adj. "accompanied by a guest"
Main Entry:  plus-one
Part of Speech:  n
Definition:  See plus-one
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