Pronunciation (UK) IPA (key): /prəˈpəʊnənt/ (US) IPA (key): /prəˈpoʊnənt/ Hyphenation: pro‧po‧nent Audio (US)(file) Noun Singular proponent Plural proponents A proponent is a person who supports a theory or proposal. Synonyms: advocate and supporter Antonyms: detractor and opponent Wikiwand - on Seamless Wikipedia browsing. On steroids.Remove ads