As a former high school athlete, the principal is a big proponent of Title IX.
Lucretia Coffin Mott and Elizabeth Cady Stanton were among the first proponent of women's suffrage in United States.
I was a proponent of the judicial system until that litigious son of a gun sued me.
The word proponent is a noun.
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When she learned how the air and water were bring polluted, she became a strong proponent of ecological reforms.
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