One who argues in support of something; an advocate.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "proponent" in a sentence
"Even intelligent design's main proponent, Michael Behe, was forced to testify under oath at the 2005 Dover "intelligent design" trial that its scientific underpinnings were nonexistent."
"The measure's chief proponent is William Gates - not that Bill Gates, but the Microsoft founder's dad."
"State Sen. Eric Oemig (D-45), the main proponent for ending the exemption, was unavailable for a comment (he was at a mediation retreat according to his staff.) « Previous post"