How to Say "to determine" in Spanish
The most common Spanish word for “to determine” is “decidir” — use 'decidir' when you are making a choice or settling on a course of action, similar to 'to decide' or 'to choose'.
decidir
deh-see-DEERde.siˈðiɾ

Examples
Necesito decidir qué carrera universitaria voy a estudiar.
I need to decide what university degree I am going to study.
El árbitro decidió que fue falta y pitó el penalti.
The referee decided it was a foul and blew the whistle for the penalty.
¿Ya decidiste dónde quieres cenar esta noche?
Have you decided where you want to have dinner tonight yet?
Decidir vs. Decidirse
When used without 'se' (decidir), it means 'to decide a thing.' When used with 'se' (decidirse), it usually means 'to make up one's mind' after a period of doubt.
The Preposition Trap
Mistake: “Voy a decidir de ir al cine.”
Correction: Voy a decidir ir al cine. ('Decidir' usually takes a direct action, or the preposition 'a' when used with 'se'.)
determinar
day-ter-mee-NARde.teɾ.miˈnaɾ

Examples
La policía no pudo determinar la identidad del sospechoso.
The police could not determine the suspect's identity.
Es crucial determinar la cantidad exacta de material necesario.
It is crucial to ascertain the exact amount of necessary material.
Question Words
When figuring things out, 'determinar' is often followed by a question word (like 'qué,' 'cuándo,' or 'cómo') to introduce the information you are trying to find.
establecer
es-ta-ble-SÉRest̪aβleˈseɾ

Examples
Necesitamos establecer la causa exacta del problema.
We need to determine the exact cause of the problem.
El comité estableció el precio máximo para las entradas.
The committee fixed the maximum price for the tickets.
definir
deh-fee-neerdefiˈniɾ

Examples
Este gol va a definir el partido.
This goal is going to decide the game.
Ella hace pesas para definir sus brazos.
She lifts weights to tone her arms.
Debemos definir los límites de nuestra propiedad.
We must determine the boundaries of our property.
Resultative use
In sports, 'definir' refers to the action that finishes a play or determines who wins.
Determining vs. Defining
Mistake: “Tengo que definir si voy a la fiesta.”
Correction: Tengo que decidir si voy a la fiesta. While similar, 'definir' is used more for establishing boundaries or explaining, whereas 'decidir' is for personal choices.
resolver
reh-sol-VEHRre.solˈβeɾ

Examples
Se resolvió a estudiar medicina, aunque fuera difícil.
She decided (resolved herself) to study medicine, even if it was difficult.
El juez resolvió que la propiedad debía venderse.
The judge determined that the property had to be sold.
Ellos resolvieron no hablar del tema nunca más.
They decided not to talk about the subject ever again.
Using the Reflexive Form
When 'resolver' means 'to decide' or 'to make up one's mind,' it often uses the reflexive form: resolverse (e.g., me resolví, te resolviste).
Following with 'a'
When you decide to do an action, you usually connect resolverse to the next verb using the preposition 'a': Se resolvió a viajar (He decided to travel).
Decidir vs. Determinar
Related Translations
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