This is the 192nd most frequent Spanish word.
principal
"Principal" in Spanish means "main" or "chief."
In this sentence, 'principal' is used as a noun to refer to the head or leader within a specific context, in this case, the school.
El director del colegio es el principal del lugar.
The school principal is the head of the place.
Here, 'principal' is used as a substantive adjective to denote the most important matter or aspect under discussion.
Lo principal es enfocarse en los resultados.
The main thing is to focus on the outcomes.
Here 'principal' is used as an adjective to emphasize the primary or main aspect of the objective in terms of importance.