si

/si/
1. General
conjunction

if

whether

Si tu veux, on peut se capter demain.

If you want, we can meet up tomorrow.

2. General
adverb

yes (used to contradict a negative statement or question)

Tu n'as pas faim ? Si, j'ai très faim !

You're not hungry? Yes, I am — I'm very hungry!

Synonyms:mais si, bien au contraire
3. General
adverb

so

to such a degree

Il est si grand qu'on le remarque tout de suite.

He's so tall that you notice him right away.

Synonyms:tellement
si - French Definition & Examples