In 1–2 sentences, explain how the author refines the definition of partisan in the second sentence, and provide a third sentence that further refines the definition.

In the second sentence, the author refines the definition of partisan by specifying that it refers to someone who is biased towards a particular political party. Taking it a step further, the author elaborates by stating that a partisan is someone who exhibits strong support and loyalty to a specific political group, often to the point of being uncompromising and exhibiting hostility towards opposing views.

The author refines the definition of partisan in the second sentence by describing it as "a fervent, sometimes militant supporter or proponent of a party, cause, faction, person, or idea." To further refine the definition, a partisan is someone who exhibits strong, unwavering loyalty and support towards a specific party, cause, faction, person, or idea, often to the extent of being combative or confrontational towards opposing viewpoints.