If you are a proponent of a particular idea or course of action, you actively support it. Halsey was identified as a leading proponent of the values of progressive education. = advocate opponent. someone who supports something or persuades people to do something = advocate opponent proponent of (present participle of proponere; PROPOUND)
a person who is required to establish a free growing stand on an area under a prescription or under another form of authorization The proponent is generally the forest licensee or the District Manager