vs 

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"Si" is a form of "si", a conjunction which is often translated as "if". "De acuerdo" is an interjection which is often translated as "okay". Learn more about the difference between "si" and "de acuerdo" below.
si(
see
)
A conjunction is a word that connects words, phrases, clauses, or sentences (e.g., The cat and the dog slept.).
conjunction
a. if
Si llueve mañana, cancelaremos el pícnic.If it rains tomorrow, we will cancel the picnic.
a. whether
Preguntó si me estaba divirtiendo.He asked whether I was enjoying myself.
b. if
Paco quiere saber si Laura también va a asistir.Paco wants to know if Laura is also going to attend.
A masculine noun is used with masculine articles and adjectives (e.g., el hombre guapo, el sol amarillo).
masculine noun
a. B
Primero lo oí en si menor.I first heard it played in B minor.
b. ti (solfége)
Practiquemos las escalas en orden inverso: do, si, la...Let's practice scales in reverse order: do, ti, la...
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de acuerdo(
deh
 
ah
-
kwehr
-
doh
)
An interjection is a short utterance that expresses emotion, hesitation, or protest (e.g., Wow!).
interjection
a. okay
De acuerdo, iremos todos al concierto.Okay, we'll all go to the concert.
b. all right
¿Te marco al rato? - De acuerdo.I'll call you in a bit? - All right.
c. OK
¿Nos vemos aquí a las siete? - De acuerdo.We'll see each other here at seven? - OK.
A phrase is a group of words commonly used together (e.g., once upon a time).
phrase
a. in agreement
Los dos partidos no están de acuerdo en cómo solucionar el problema de la violencia en las escuelas.The two parties are not in agreement over how to solve the problem of violence in schools.
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