proponent
n. countablen. a person who publicly supports an idea, plan, or way of doing something. You use this word when someone is trying to convince others that a specific choice is the right one.
n. a person who advocates for or supports a particular theory, proposal, or course of action. Often contrasted with 'opponent' in formal debates or legal contexts.
She is a strong proponent of renewable energy.
As a leading proponent of the new tax reform, the senator spent months explaining its benefits to the public.
While some experts remain skeptical of the technology, its proponents argue that the long-term efficiency gains will far outweigh the initial investment costs required for implementation.
From Latin prōpōnēns, present participle of prōpōnō (“to put forward; propose”).
Commonly followed by the preposition 'of' to indicate the cause or idea being supported.