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.
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.
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.