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According to the Merriam-Webster Dictionary:
Major party: a political party having electoral strength sufficient to permit it to win control of a government usually with comparative regularity and when defeated to constitute the principal opposition to the party in power.
— Merriam-Webster Dictionary online
Major parties hold a significant percentage of the vote in elections and claim higher membership than minor parties. Typically, major parties have the most donors, best-organized support networks and excellent funding for elections. Their candidates for political positions are closely watched since they have the highest chance of being elected to office because of the high membership, recognition and donations that these parties are able to generate.
Two major parties can lead to a two-party system. If there is only one major party, then it is a dominant-party system. In a multi-party system, a major party is one that occasionally controls the presidency or premiership and is the most influential party in a coalition government.
List of major parties 
See also 
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