Plus-one Definition
noun
Alternative spelling of plus one.
Wiktionary
A friend or date whom one brings along to an event.
Wiktionary
Other Word Forms of Plus-one
Noun
Singular:
plus-one
Plural:
plus-onesOrigin of Plus-one
From the custom of inviting (for example) "John Doe plus one" to an event, if John Doe is unmarried but is welcome to bring a friend or date.
From Wiktionary
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