How to Say "plus-one" in Spanish
The Spanish word for “plus-one” is “acompañante” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
a guest brought to a party

Examples
Cada paciente puede tener un acompañante en la habitación.
Each patient can have one companion in the room.
¿Vas a traer un acompañante a la fiesta?
Are you bringing a plus-one to the party?
One word for both genders
This word doesn't change its ending. Use 'el' for a man and 'la' for a woman, but the word always stays 'acompañante'.
Don't say 'acompañanta'
Mistake: “La acompañanta.”
Correction: La acompañante. Words ending in -ante usually stay the same for everyone.
Related Translations
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