proponent
UK: /prəˈpəʊnənt/ | US: /prəˈpoʊnənt/
n. a person who advocates or supports a theory, proposal, or project
n. (archaic) one who puts forward a proposition or argument
Derived from Latin prōpōnere ("to put forward"), combining pro- (forward) and ponere (to put). The suffix -ent marks the agent (one who performs the action). The word entered English in the 16th century, retaining its core sense of advocating or proposing ideas. The morphemes reflect a logical progression: "putting forward" → "one who puts forward."
She was a vocal proponent of renewable energy policies.
The senator is a leading proponent of healthcare reform.
Early proponents of the theory faced strong opposition.
As a proponent of free speech, he defended controversial opinions.
The proposal’s proponents argued it would boost economic growth.