Also means
supporter
Usage Note
Partidario as an adjective means 'in favour of' and is followed by de: soy partidario de la negociación ('I am in favour of negotiation'). As a noun, un partidario is a supporter or partisan of a cause or party. It is more formal and political than fanático or aficionado, and does not imply fanaticism — simply being an advocate of a position.
Examples
"Es partidario de reducir los impuestos."
Natural Translation
He is in favour of reducing taxes.

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