Usage Note
Principal is invariable in form — the same spelling serves masculine and feminine (el actor principal, la actriz principal). It typically precedes or follows the noun it modifies and has no apocopated form. Unlike English, it is not used to refer to a school head; a school principal in Spanish is a director or directora.
Examples
"La causa principal del problema es el dinero."
Natural Translation
The main cause of the problem is money.
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