proponent

[pruh-poh-nuhnt]
noun
1.
a person who puts forward a proposition or proposal.
2.
a person who argues in favor of something; an advocate.
3.
a personwho supports a cause or doctrine; adherent.
4.
a person who propounds a legal instrument, such as a will for probate.

Origin:
1580–90; < Latin prōpōnent- (stem of prōpōnēns). See propone, -ent

antagonist, proponent, protagonist.


2, 3. supporter, champion, enthusiast.
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World English Dictionary
proponent (prəˈpəʊnənt)
 
n
1.  a person who argues in favour of something
2.  law a person who seeks probate of a will
 
[C16: from Latin prōpōnere to propose]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

proponent
1580s, "one who brings forth a proposition or argument," from L. proponentem (nom. proponens), prp. of proponere "put forward" (see propound).
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
McCarthy was a strong proponent of nuclear power, even offering to eat a gram
  of plutonium to show how safe it was.
Once the clout of an advocate is weakened, the stage is set for dismissal of
  the proponent's position.
And the governor has been a proponent of adult stem-cell research, for economic
  reasons as well as ethical ones.
He became a big proponent of reverse psychology, baiting opponents into
  underestimating your strength.
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