Etymology
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democratic (adj.)

c. 1600, "of the nature of or characterized by democracy; pertaining to democracy," from French démocratique, from Medieval Latin democraticus, from Greek demokratikos "of or for democracy; favoring democracy," from demokratia "popular government" (see democracy). Earlier was democratian (1570s), democratical (1580s). Related: Democratically.

As a political faction name, from 1790 in reference to France. U.S. political usage (with a capital D) attested from c. 1800. The party originally was the Anti-Federal party, then the Democratic-Republican (Democratic for short). It formed among those opposed to extensive powers for the U.S. federal government. The name of the party was not formally shortened to Democratic until 1829. Democratic socialism is attested from 1849.

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party (v.)
"have a good time," 1922, from party (n.). Earlier as "to take the side of" (1630s). Related: Partied; partying.
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party (n.)

c. 1300, partie, "a part, division, section, portion," a sense now obsolete; also "physical piece, fragment; section of a book or treatise," from Old French partie "side, part; portion, share; separation, division" (12c.), literally "that which is divided," noun use of fem. past participle of partir "to divide, separate" (10c.), from Latin partire/partiri "to share, part, distribute, divide," from pars "a part, piece, a share" (from PIE root *pere- (2) "to grant, allot").

In early use the word often appears where we would have its relative part (n.). Also from c. 1300 in the legal sense "person or group of persons involved in a lawsuit, agreement, etc.," and in the political sense of "a number of persons united in supporting a person, policy, or cause." From early 14c. as any "group of people," also "a social class." Meaning "a person, a paritcular person" is from mid-15c.

The military sense of "a detached part of a larger body or company" is by 1640s. The sense of "a gathering for social pleasure" is found by 1716, from general sense of persons gathered (originally for some specific, temporary purpose, such as dinner party, hunting party).

Phrase the party is over "enjoyment or pleasant times have come to an end" is from 1937; party line is recorded by 1834 in the sense of "policy adopted by a political party," and by 1893 in the sense of "telephone line shared by two or more subscribers." Party pooper "one who casts gloom over a convivial event" is from 1951, American English.

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tea party (n.)
1772, from tea + party (n.). Political references to tea party all trace to the Boston tea party of 1773 (the name seems to date from 1824), in which radicals in Massachusetts colony boarded British ships carrying tea and threw the product into Boston Harbor in protest against royal taxation. It has been a model for libertarian political actions in the U.S. (generally symbolic), including citizen gatherings begun in early 2009 to protest government spending.
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Dixiecrat (n.)

in U.S. politics, "Democratic politician from the South who seceded from the party over the extension of civil rights," 1948, from Dixie + ending from Democrat.

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GOP 
also G.O.P., "U.S. Republican Party," 1884, an abbreviation of Grand Old Party. The Republicans were so called from 1876; the Democratic Party also was referred to occasionally as grand old party, with lower-case letters, in 1870s-80s when the Republicans (formed in 1854) still were considered new and radical. The designation grand old ______ is from about 1850; in Great Britain, Lord Palmerston was known as the Grand Old Man by 1880, and it was abbreviated to G.O.M. by 1882.
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Barn-burner (n.)
also barnburner, by 1844, American English, a member of the more progressive faction of the New York Democratic Party (opposed to the Hunkers); the nickname is an allusion to the old story of the farmer who, to rid his barn of rats, burned it down.
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watergate (n.)
mid-14c., "channel for water;" late 14c., "flood-gate;" from water (n.1) + gate (n.). The name of a building in Washington, D.C., that housed the headquarters of the Democratic Party in the 1972 presidential election, it was burglarized June 17, 1972, which led to the resignation of President Nixon.
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Menshevik (adj.)

1907, from Russian men'shevik, from men'she "lesser" (comparative of malo "little," from PIE root *mei- (2) "small") + -evik "one that is." So called by Lenin because they were a minority in the party. The Russian word was used earlier in reference to the minority faction of the Social-Democratic Party when it split in 1903. See Bolshevik. As a noun from 1917. Russian plural mensheviki occasionally was used in English. Related: Menshevism; Menshevist.

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