How do you say second in french?

"Second" in French can be said in two ways, depending on the context:

1. As an ordinal number: Deuxième

* Example: "Le deuxième étage" (The second floor)

2. As a unit of time: Seconde

* Example: "Une seconde" (One second)

So, to avoid confusion, you need to consider the context when choosing the right word.