Etymology
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plebeian (adj.)

"of or characteristic of the lower class or the common people," 1560s in a Roman historical sense, from Latin plebeius "belonging to the plebs," earlier plebes, "the populace, the common people" (as opposed to patricians, etc.), also "commonality; the mass, the multitude; the lower class" (from PIE *ple-, from root *pele- (1) "to fill"). In general (non-historical) use from 1580s.

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nematode (n.)

a thread-worm, roundworm, pin-worm, etc., 1865, from Modern Latin Nematoda, the class or phylum name.

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demotion (n.)

"act or fact of being reduced to a lower rank or class," 1890, noun of action from demote (v.).

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mammalian (adj.)

"of or pertaining to the mammals," 1813, from mammal + -ian. As a noun, "an animal of the class Mammalia," from 1835.

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plutocracy (n.)

"government by the wealthy class; a class ruling by virtue of wealth," 1650s, from Greek ploutokratia "rule or power of the wealthy or of wealth," from ploutos "wealth" (see Pluto) + -kratia "rule" (see -cracy). Synonym plutarchy is slightly older (1640s). Pluto-democracy "plutocracy masquerading as democracy" is from 1895.

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proletarian 

1650s (n.) "member of the lowest or poorest class of a community;" 1660s (adj.) "of or belonging to the lowest class of people," hence "mean, vile, vulgar;" with -ian + Latin proletarius "citizen of the lowest class" (as an adjective, "relating to offspring"), from proles "offspring, progeny" (see prolific). In ancient Rome, according to the traditional division of the state, the proletarius was one of the propertyless people, exempted from taxes and military service, who served the state only by having children. The modern political sense of proletarian is by 1851.

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haute (adj.)
French, literally "high," fem. of haut (see haught). Haute bourgeoisie "the (French) upper-middle class" is in English from 1804.
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lecturer (n.)
1580s, as a class of preachers, agent noun from lecture (v.). From 1610s as "one who gives formal lectures."
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intelligentsia (n.)
"the intellectual class collectively," 1905, from Russian intelligyentsiya, from Latin intelligentia "intelligence" (see intelligence). Perhaps via Italian intelligenzia.
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haute cuisine (n.)
1829, French, literally "high(-class) cooking;" see haught + cuisine. Usually in italics until 1960s.
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