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Predecir vs. prever vs. pronosticar

The Spanish verbs predecir, prever, and pronosticar all broadly deal with the concept of foreseeing or predicting events, situations, or outcomes. While these terms are often used interchangeably, they do have subtle differences that make them more appropriate in certain contexts.

Predecir

A2
The verb predecir translates to to predict in English. It generally refers to the act of declaring or announcing an event before it happens, often without clear evidence or based on intuition.
El horóscopo predijo su futuro.
(The horoscope predicted her future.)
El meteorólogo predijo lluvia para mañana.
(The weatherman predicted rain for tomorrow.)

Prever

B1
Prever also means to predict, but this verb implies a stronger rationale, often based on tangible indications or data. It is more akin to forecasting or anticipating based on existing information.
El economista previó un incremento en la inflación.
(The economist forecasted an increase in inflation.)
La empresa previó una disminución en las ventas este año.
(The company anticipated a decrease in sales this year.)

Pronosticar

B2
Pronosticar is closest to the English term to forecast. It predominantly refers to predicting based on analysis and scientific methods. It's particularly common in meteorology, sports, and other fields that require measurable predictions.
El médico pronosticó una recuperación completa.
(The doctor forecasted a complete recovery.)
Las estadísticas pronostican un triunfo del equipo local.
('Statistics forecast a victory for the local team.)

Summary

Predecir, prever, and pronosticar are related verbs in Spanish dealing with foresight and prediction. While there is overlap, predecir tends toward announcing events often based on intuition, prever involves anticipation rooted in evidence, and pronosticar denotes scientific forecasting.