What does Si mean in french?

"Si" in French means "if". It's a conjunction that introduces a conditional clause.

Here are some examples:

* Si tu étudies, tu réussiras. (If you study, you will succeed.)

* Si j'avais le temps, j'irais au cinéma. (If I had time, I would go to the cinema.)

* Si tu veux, on peut manger au restaurant. (If you want, we can eat at the restaurant.)

It's important to note that "Si" is often used in conjunction with the subjunctive mood in French, especially when expressing hypothetical situations or wishes.