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 you’re in favor of long school vacations, you’re pro or "for" long vacations. The prefix pro- also carries the meaning of “forward,” “ahead,” or “before.” All of these senses are at work in proponent: someone who suggests (puts forward) an idea or who is in favor of an idea. A proponent proposes an idea or advocates for a proposal or a proposition.

Definitions of proponent
  1. noun
    a person who pleads for a cause or propounds an idea
    synonyms: advocate, advocator, exponent
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    Samuel Adams
    American Revolutionary leader and patriot; an organizer of the Boston Tea Party and signer of the Declaration of Independence (1722-1803)
    Susan Brownell Anthony
    United States suffragist (1820-1906)
    William Dawes
    American patriot who rode with Paul Revere to warn that the British were advancing on Lexington and Concord (1745-1799)
    Benjamin Franklin
    printer whose success as an author led him to take up politics; he helped draw up the Declaration of Independence and the Constitution; he played a major role in the American Revolution and negotiated French support for the colonists; as a scientist he is remembered particularly for his research in electricity (1706-1790)
    Mohandas Karamchand Gandhi
    political and spiritual leader during India's struggle with Great Britain for home rule; an advocate of passive resistance (1869-1948)
    Nathan Hale
    a soldier of the American Revolution who was hanged as a spy by the British; his last words were supposed to have been `I only regret that I have but one life to give for my country' (1755-1776)
    John Hancock
    American revolutionary patriot who was president of the Continental Congress; was the first signer of the Declaration of Independence (1737-1793)
    Patrick Henry
    a leader of the American Revolution and a famous orator who spoke out against British rule of the American colonies (1736-1799)
    Francis Hopkinson
    American Revolutionary leader and patriot; a signer of the Declaration of Independence (1737-1791)
    Julia Ward Howe
    United States feminist who was active in the women's suffrage movement (1819-1910)
    Samuel Huntington
    American revolutionary leader who signed the Declaration of Independence and was president of the Continental Congress (1731-1796)
    Henry Laurens
    leader of the American Revolution and president of the Continental Congress (1724-1792)
    Richard Henry Lee
    leader of the American Revolution who proposed the resolution calling for independence of the American Colonies (1732-1794)
    Mary Ashton Rice Livermore
    United States suffragist (1820-1905)
    Robert R. Livingston
    American Revolutionary leader who served in the Continental Congress and as minister to France (1746-1813)
    Nelson Rolihlahla Mandela
    South African statesman who was released from prison to become the nation's first democratically elected president in 1994 (born in 1918)
    George Mason
    American Revolutionary leader from Virginia whose objections led to the drafting of the Bill of Rights (1725-1792)
    Robert Morris
    leader of the American Revolution who signed the Declaration of Independence and raised money for the Continental Army (1734-1806)
    Esther Hobart McQuigg Slack Morris
    United States suffragist in Wyoming (1814-1902)
    Lucretia Coffin Mott
    United States feminist and suffragist (1793-1880)
    Thomas Paine
    American Revolutionary leader and pamphleteer (born in England) who supported the American colonist's fight for independence and supported the French Revolution (1737-1809)
    Robert Treat Paine
    American Revolutionary leader and signer of the Declaration of Independence (1731-1814)
    Charles Stewart Parnell
    Irish nationalist leader (1846-1891)
    William Patterson
    American Revolutionary leader (born in Ireland) who was a member of the Constitutional Convention (1745-1806)
    Josiah Quincy
    American patriot who presented the colonists' grievances to the English king (1744-1775)
    Jeannette Rankin
    leader in the women's suffrage movement in Montana; the first woman to serve in the United States House of Representatives (1880-1973)
    Paul Revere
    American silversmith remembered for his midnight ride (celebrated in a poem by Longfellow) to warn the colonists in Lexington and Concord that British troops were coming (1735-1818)
    Benjamin Rush
    physician and American Revolutionary leader; signer of the Declaration of Independence (1745-1813)
    Haym Salomon
    American financier and American Revolutionary War patriot who helped fund the army during the American Revolution (1740?-1785)
    Anna Howard Shaw
    United States physician and suffragist (1847-1919)
    Roger Sherman
    American Revolutionary leader and signer of the Declaration of Independence and the Articles of Confederation and the United States Constitution (1721-1793)
    Julia Evelina Smith
    United States suffragist who refused to pay taxes until she could vote (1792-1886)
    Elizabeth Cady Stanton
    United States suffragist and feminist; called for reform of the practices that perpetuated sexual inequality (1815-1902)
    Baron Friedrich Wilhelm Ludolf Gerhard Augustin von Steuben
    American Revolutionary leader (born in Prussia) who trained the troops under George Washington (1730-1794)
    Lucy Stone
    United States feminist and suffragist (1818-1893)
    Jonathan Trumbull
    American Revolutionary leader who as governor of Connecticut provided supplies for the Continental Army (1710-1785)
    Frances Elizabeth Caroline Willard
    United States advocate of temperance and women's suffrage (1839-1898)
    James Wilson
    American Revolutionary leader who was one of the signers of the Declaration of Independence (1742-1798)
    John Witherspoon
    American Revolutionary leader and educator (born in Scotland) who signed of the Declaration of Independence and was president of the college that became Princeton University (1723-1794)
    Victoria Clafin Woodhull
    United States advocate of women's suffrage; in 1872 she was the first woman to run for the United States presidency (1838-1927)
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    apologist, justifier, vindicator
    a person who argues to defend or justify some policy or institution
    an advocate of constitutional government
    an advocate of Darwinism
    democrat, populist
    an advocate of democratic principles
    an advocate of federalism
    an advocate of Gnosticism
    humanist, humanitarian
    an advocate of the principles of humanism; someone concerned with the interests and welfare of humans
    ideologist, ideologue
    an advocate of some ideology
    an advocate of internationalism
    irredentist, irridentist
    an advocate of irredentism
    an advocate of isolationism in international affairs
    an advocate of Jansenism
    an advocate of libertarianism
    an advocate of Maoism
    an advocate of Marxism
    an advocate of national independence of or a strong national government
    an advocate of neoclassicism
    an advocate of neutrality in international affairs
    an advocate of nullification; someone who believes that a state can resist federal laws
    drumbeater, partisan, zealot
    a fervent and even militant proponent of something
    an advocate of partitioning a country
    an advocate of Platonism
    an advocate of full legal protection for embryos and fetuses; someone opposed to legalized induced abortion
    presenter, sponsor
    an advocate who presents a person (as for an award or a degree or an introduction etc.)
    an advocate of protectionism
    an advocate of a republic (usually in opposition to a monarchy)
    an advocate of strict observance of ritualistic forms
    an advocate of rural living
    an advocate of secessionism
    an advocate of secularism; someone who believes that religion should be excluded from government and education
    separationist, separatist
    an advocate of secession or separation from a larger group (such as an established church or a national union)
    interpreter, representative, spokesperson, voice
    an advocate who represents someone else's policy or purpose
    an advocate of the extension of voting rights (especially to women)
    admirer, booster, champion, friend, protagonist, supporter
    a person who backs a politician or a team etc.
    a person who advocates the supremacy of some particular group or race over all others
    advocate of teleology
    an advocate of Thatcherism
    an advocate of unilateralism
    an informal representative
    anglophil, anglophile
    an admirer of England and things English
    believer, truster
    a supporter who accepts something as true
    a prejudiced person who is intolerant of any opinions differing from his own
    a devoted admirer and recorder of another's words and deeds
    an enthusiastic and vocal supporter
    civil libertarian
    a libertarian who is actively concerned with the protection of civil liberties
    a supporter of the Confederate States of America
    a supporter of corporatism
    doctrinaire, dogmatist
    a stubborn person of arbitrary or arrogant opinions
    economic libertarian
    a libertarian who advocates maximizing individual rights and minimizing the role of the state
    enthusiast, partisan, partizan
    an ardent and enthusiastic supporter of some person or activity
    flack, flack catcher, flak, flak catcher
    a slick spokesperson who can turn any criticism to the advantage of their employer
    Francophil, Francophile
    an admirer of France and everything French
    free trader
    an advocate of unrestricted international trade
    an adherent of functionalism
    a supporter of James II after he was overthrown or a supporter of the Stuarts
    loyalist, stalwart
    a person who is loyal to their allegiance (especially in times of revolt)
    mouth, mouthpiece
    a spokesperson (as a lawyer)
    nationalist leader
    the leader of a nationalist movement
    New Dealer
    a supporter of the economic policies in the United States known as the New Deal
    Graecophile, philhellene, philhellenist
    an admirer of Greece and everything Greek
    mainstay, pillar
    a prominent supporter
    a supporter of parliament and Oliver Cromwell during the English Civil War
    someone who endorses a motion or petition as a necessary preliminary to a discussion or vote
    an admirer of G. B. Shaw or his works
    a male spokesperson
    a female spokesperson
    endorser, indorser, ratifier, subscriber
    someone who expresses strong approval
    a woman advocate of women's right to vote (especially a militant advocate in the United Kingdom at the beginning of the 20th century)
    sympathiser, sympathizer, well-wisher
    someone who shares your feelings or opinions and hopes that you will be successful
    toaster, wassailer
    someone who proposes a toast; someone who drinks to the health of success of someone or some venture
    bagman, commercial traveler, commercial traveller, roadman, traveling salesman, travelling salesman
    a salesman who travels to call on customers
    maintainer, sustainer, upholder
    someone who upholds or maintains
    verifier, voucher
    someone who vouches for another or for the correctness of a statement
    a supporter of the American Revolution
    white separatist
    someone who advocates a society in which white people live separately from members of other races
    white supremacist
    a person who believes that the white race is or should be supreme
    type of:
    individual, mortal, person, somebody, someone, soul
    a human being
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