Definition of plus-one in English:

plus-one

Syllabification: plus-one

noun

informal
A person’s guest at a social function.
More example sentences
  • You see, my plus one was visiting from out of town, so I had to take care of her.
  • Assuming I get in, I would love it if someone could be my plus one to accompany me to my FIRST prom ever.

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Definition of plus-one in:

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Word of the day conspicuous
Pronunciation: kənˈspikyo͞oəs
adjective
standing out so as to be clearly visible