proponent (of something)(formal)a person who supports an idea or course of actionsynonymadvocateWord Originlate 16th cent.: from Latinproponent-
, from the verb proponere
, from pro-
.Extra examplesProponents argue the dam will prevent flooding.She is among the most outspoken proponents of the plan.The theory does still have its proponents.There has been intensive campaigning by the proponents of each of the bidding cities.