proponent of definition
proponent Proponent means someone who is in favor of something. You might be a proponent of longer vacations, but your parents are proponents of a longer school year. If youâre in favor of long school vacations, youâre pro or for long vacations. The prefix pro- also carries the meaning of âforward,â âahead,â or âbefore.â All of these senses are at work in proponent: someone who suggests (puts forward) an idea or who is in favor of an idea.