Usage Note
Activista is a common-gender noun — el activista or la activista — and always ends in -a regardless of the referent's gender. It is typically modified by a cause: activista medioambiental, activista de derechos humanos. The word carries a broadly positive connotation in modern Spanish press.
Examples
"La activista exigió cambios en la ley."
Natural Translation
The activist demanded changes to the law.

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