: 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

Examples of plus-one in a Sentence

Recent Examples on the Web
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Echoing Vallario, Hoover knew that Burch and Derek Blasberg, the hosts—both of whom are parents—wouldn’t bat an eye at a tiny plus-one. Hannah Jackson, Vogue, 15 Sep. 2025 Sheryl Lee Ralph brought her husband of 20 years, Vincent Hughes, as her plus-one to MPTF's An Evening Before. Alex Apatoff, PEOPLE, 15 Sep. 2025 And there’s also the suggestion that Michaela believes Simone is betraying the feminist cause by settling at such a young age for the role of plus-one to a wealthy man who treats his relationships like a transaction. Roxana Hadadi, Vulture, 10 Sep. 2025 The young woman who knocked Mathias unconscious without laying a hand on him is Claude (Nadia Tereszkiewicz, of The Crime Is Mine), who came to the party reluctantly, the plus-one of her gallerist husband, Pierre (Jeremy Lewin). Sheri Linden, HollywoodReporter, 9 Sep. 2025 See All Example Sentences for plus-one

Word History

First Known Use

1977, in the meaning defined above

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

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Cite this Entry

“Plus-one.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/plus-one. Accessed 19 Sep. 2025.

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