Etymology
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conservative (adj.)

late 14c., conservatyf, "tending to preserve or protect, preservative, having the power to keep whole or safe," from Old French conservatif, from Medieval Latin conservativus, from Latin conservatus, past participle of conservare "to keep, preserve, keep intact, guard," from assimilated form of com-, here perhaps an intensive prefix (see com-), + servare "keep watch, maintain" (from PIE root *ser- (1) "to protect").

From 1840 in the general sense "disposed to retain and maintain what is established, opposed to innovation and change," or, in a negative sense "opposed to progress."

As a modern political tradition, "antagonistic to change in the institutions of a country," often especially "opposed to changes toward pure democracy," conservatism traces to Edmund Burke's opposition to the French Revolution (1790), but the word conservative is not found in his writing. It was coined by his French disciples (such as Chateaubriand, who titled his journal defending clerical and political restoration "Le Conservateur").

Conservative as the name of a British political faction first appeared in an 1830 issue of the "Quarterly Review," in an unsigned article sometimes attributed to John Wilson Croker. It replaced Tory (q.v.) by 1843, reflecting both a change from the pejorative name (in use for 150 years) and repudiation of some reactionary policies.

Strictly speaking, conservatism is not a political system, and certainly not an ideology. ... Instead, conservatism is a way of looking at the civil social order. ... Unlike socialism, anarchism, and even liberalism, then, conservatism offers no universal pattern of politics for adoption everywhere. On the contrary, conservatives reason that social institutions always must differ considerably from nation to nation, since any land's politics must be the product of that country's dominant religion, ancient customs, and historical experience. [Russell Kirk, "What is Conservatism," introduction to "The Portable Conservative Reader," 1982] 

Phrases such as conservative estimate (1874), in which it means "characterized by caution, deliberately low," make no sense etymologically. Related: Conservatively; conservativeness.

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conservative (n.)

late 14c., "means of preservation, a preservative," from conservative (adj.). The political use is by 1831, originally in a British context. 

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neo-conservative (n.)

also neoconservative; used in the modern sense by 1979:

My Republican vote [in the 1972 presidential election] produced little shock waves in the New York intellectual community. It didn't take long — a year or two — for the socialist writer Michael Harrington to come up with the term "neoconservative" to describe a renegade liberal like myself. To the chagrin of some of my friends, I decided to accept that term; there was no point calling myself a liberal when no one else did. [Irving Kristol, "Forty Good Years," The Public Interest, spring 2005]

The term is attested from by 1964 (neo-conservatism is by 1959; new conservative is from mid-1950s), originally often applied to Russell Kirk and his followers, who would be philosophically opposed to the later neocons. From neo- "new" + conservative (n.).

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conservatism (n.)

1835, "political principles and opinions of the Conservative party in British politics;" from conservative + -ism. From 1838 in reference to conservative principles generally, "disposition to maintain and adhere to the established order of things, wariness of innovation or change."

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*ser- (1)

Proto-Indo-European root meaning "to protect." It forms all or part of: conservation; conservative; conserve; observance; observatory; observe; preserve; reservation; reserve; reservoir.

It is the hypothetical source of/evidence for its existence is provided by: Avestan haurvaiti "to guard;" Latin servare "to guard, keep, watch;" Old Church Slavonic xraniti "to guard, protect;" Old High German gi-sarwi "armor, equipment," Old English searu "art, skill; wile, deceit."

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Hunker (n.)

"conservative, fogey," 1849, American English, especially and originally "one of the conservative Democrats of New York of the 1840s" (opposed to the Barnburners). Supposedly from New York dialect hunk "post, station, home," hence "those who stay safe on base" (see hunky-dory), but it also has been said to be from a local word for a curmudgeon, and hunks is recorded from c. 1600 as a name for a surly, crusty old person or miser.

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conservationist (n.)

"advocate of conservation," 1861, from conservation + -ist. The ecological sense is from 1903. Conservatist (1849) was used in the sense "conservative."

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con (n.2)

a slang or colloquial shortening of various nouns beginning in con-, such as, from the 19th century, confidant, conundrum, conformist, convict, contract, and from the 20th century, conductor, conservative.

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rightist (adj.)

"favoring the (political) right, conservative," by 1902, from right (n.) in the political sense + -ist. Related: Rightism (by 1936 in contrast to leftism).

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