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Soir vs. soirée

Word practice demo
While both the French words soir and soirée translate to "evening" in English, they are not interchangeable. The key difference lies in what they emphasize: soir refers to a specific point in time, while soirée focuses on the duration of that time and the activities that fill it.

Soir

A1
The word soir refers to the evening as a point in time or a simple time marker. It is objective and factual, indicating the part of the day between late afternoon and bedtime. Use soir when you are specifying when something happens.
Je t'appelle demain soir.
(I will call you tomorrow evening.)
Le musée ferme à 21 heures le soir.
(The museum closes at 9 PM in the evening.)
Que fais-tu ce soir ?
(What are you doing this evening?)
En général, je lis un peu le soir avant de dormir.
(In general, I read a little in the evening before sleeping.)
Le journal télévisé est à vingt heures le soir.
(The television news is at eight o'clock in the evening.)

Soirée

A2
The word soirée emphasizes the duration of the evening and what happens during that time. It often implies a social event, an activity, or a subjective experience. It is also commonly used to mean "party" or "event".
J'ai passé une très bonne soirée avec mes amis.
(I had a very good evening with my friends.)
Passe une excellente soirée !
(Have an excellent evening!)
Nous sommes allés à une soirée costumée pour Halloween.
(We went to a costume party for Halloween.)
La soirée a commencé par un dîner et s'est terminée en musique.
(The evening began with a dinner and ended with music.)
J'ai prévu une soirée tranquille à la maison.
(I have planned a quiet evening at home.)

Summary

In short, use soir when you are talking about the evening as a time marker (when?). Use soirée when you are describing the content, duration, or experience of the evening, or an event itself (what happened?). A simple rule of thumb for greetings is to say Bonsoir when you arrive somewhere in the evening, and Bonne soirée ! when you leave, wishing the other person a pleasant time for the rest of the evening.