The Spanish word for yes
Encoding Strategies:
repetition

Sí is the Spanish word for yes, the opposite of no.
sí
yes
Used to affirm or agree with something.
¿Quieres venir a la fiesta? — Sí, claroDo you want to come to the party? — Yes, of course
¿Ya terminaste? — Sí, hace un ratoAre you done? — Yes, a little while ago
do, does, did
Used to stress that yes, something is true.
Yo no fui, pero ella síI didn't go, but she did (I didn't go, but her, yes)
No me gusta el café, pero sí me gusta el téI don't like coffee, but I do like tea (I don't like coffee, but yes I like tea)
The reflexive pronoun used after prepositions, the counterpart of se
Encoding Strategies:
repetition
linguistic

se
itself
(reflexive pronoun)
Sí is the prepositional form of the reflexive se0, the reflexive pronoun used with verbs. Just like me becomes mí after a preposition (para mí), and te becomes ti (para ti), se becomes sí (para sí).
sí
himself, herself, itself, themselves, yourself
The reflexive pronoun used after prepositions for the third person (and formal second person). Just like mí and ti, it always follows a preposition.
Guardó el secreto para síShe kept the secret to herself
El proyecto tiene valor en síThe project has value in itself
sí mismo
himself, herself, itself, oneself
Sí is often paired with mismo for extra emphasis, just like "himself" vs "him" in English.
Solo piensa en sí mismoHe only thinks about himself
Habla bien de sí mismaShe speaks well of herself
Lo hizo por sí mismo, sin ayudaHe did it by himself, without help