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proponent (noun) supporter.
A proponent of a theory or a course of action is a supporter of the theory or the course of action. Darwin was the proponent of the theory of evolution; that is, he was a supporter of the theory of evolution. The proponents of the abolition of segregation support the abolition of racism.
- There are still some proponents of the flat earth theory; they still support the theory that the earth is flat.
- The proponents of compulsory birth control ignore the fact that it is a religious matter, and if they press it too far, they are likely to offend people.