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proponent

[pruh-poh-nuh nt] /prəˈpoʊ nənt/
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 of proponent
1580-1590
1580-90; < Latin prōpōnent- (stem of prōpōnēns). See propone, -ent
Can be confused
antagonist, proponent, protagonist.
Synonyms
2, 3. supporter, champion, enthusiast.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for proponent

proponent

/prəˈpəʊnənt/
noun
1.
a person who argues in favour of something
2.
(law) a person who seeks probate of a will
Word Origin
C16: from Latin prōpōnere to propose
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for proponent
n.

1580s, "one who brings forth a proposition or argument," from Latin proponentem (nominative proponens), present participle of proponere "put forward" (see propound). In part also a native formation from propone. As an adjective from 1680s.

Online Etymology Dictionary, © 2010 Douglas Harper
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13
17
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