noun
a strong supporter of a party, cause, or person
adjective
biased or prejudiced in favor of a particular cause or group
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The partisan divide in Congress makes it difficult to pass bipartisan legislation.
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I try to avoid discussing politics with my partisan friends because we never agree.
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The debate turned into a partisan shouting match.
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Her loyalty to the company was so strong, it was almost like she was a partisan for the brand.