Originally Posted by Alpha

sustantivo
1. sí (m)
adverbio

2. sí
he said yes -> dijo que sí
didn't you hear me? — yes, I did -> no me has oído — sí
yes? -> sí?; (to somebody waiting to speak) sí?(answering phone), diga?
(español de España), dígame? (espanol de Espana), alo? (Andes, Carib), bueno? (espanol de Colombia, espanol de Mexico), hola? (RP)