How to Say "large-scale" in Spanish
The Spanish word for “large-scale” is “masivo” — B1 level. This is a very common word in everyday Spanish.

Examples
Hubo una protesta masiva en el centro de la ciudad.
There was a massive protest in the city center.
La empresa anunció despidos masivos hoy.
The company announced massive layoffs today.
Los medios de comunicación masivos influyen en la opinión pública.
Mass media outlets influence public opinion.
Matching the Ending
Remember to change the ending to 'masiva' if the thing you are describing is feminine, like 'una respuesta masiva' (a massive response).
Where to Put the Word
This word usually comes after the person or thing it describes. For example, say 'evento masivo' instead of 'masivo evento'.
Masivo vs. Grande
Mistake: “Using 'masivo' to describe a big dog or a big house.”
Correction: Use 'grande' or 'enorme' for physical size. Use 'masivo' for things involving many people or items, like a concert or a data leak.
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