This is the 456th most frequent Italian word.
sì
"Yes."
In this sentence, 'sì' is used as an affirmative response, showing agreement or acknowledgment.
Sì, ho capito la domanda.
Yes, I understood the question.
Here, 'sì' is used as a noun referring to affirmative consent or agreement.
Non so se è un sì definitivo.
I don't know if it's a definitive yes.
In this case, 'sì' is used as a quoted affirmative word for discussion.