Etymology
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parity (n.)

1570s, "equality or equivalence of rank or status," from French parité (14c.) or directly from Late Latin paritas "equality," from Latin adjective par (genitive paris) "equal" (see par (n.)). Meaning "state or condition of being on a level" is from 1610s. Meaning "condition in which adversaries have equal resources" is from 1955, originally in reference to the U.S.A. and the U.S.S.R.

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femme fatale (n.)

"attractive and dangerous woman," 1895, from French femme fatale, attested by 1844, from French femme "woman," from Latin femina "woman, a female" (see feminine) + fatale (see fatal).

Une femme fatale est une femme qui porte malheur. [Jules Claretie, "La Vie a Paris," 1896]

Earlier, such a woman might be called a Circe.

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Helen 

fem. proper name, from French Hélène, from Latin Helena, from Greek Helenē, fem. proper name, probably fem. of helenos "the bright one." In Greek legend, the sister of Castor and Pollux and wife of Menelaus, king of Sparta. Her elopement with Paris was the cause of the Trojan War. Among the top 10 popular names for girl babies in the U.S. born between 1890 and 1934.

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Tuileries 
former palace in Paris, begun by Catherine de Medici, 1564; so called because it was built on the site of an ancient tile-works, from Old French tieule "tile," from Latin tegula (see tile (n.)). The former residence of the royal court, it was destroyed by fire in 1871 and now is the site of the Jardin des Tuileries.
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bistro (n.)
1906, from French bistro (1884), originally Parisian slang for "little wineshop or restaurant," which is of unknown origin. Commonly said to be from Russian bee-stra "quickly," picked up during the Allied occupation of Paris in 1815 after the defeat of Napoleon; but this, however quaint, is unlikely. Another guess is that it is from bistraud "a little shepherd," a word of the Poitou dialect, from biste "goat."
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plaster (n.)

late Old English plaster "a medicinal solid compounded for external application," from medical Latin plastrum, shortened by loss of the original prefix from Latin emplastrum "a plaster" (in the medical as well as the building sense), from Greek emplastron "salve, plaster" (used by Galen instead of the more usual emplaston), noun use of neuter of emplastos "daubed on," from en- "on" + plastos "molded," verbal adjective from plassein "to mold" (see plasma).

The use in reference to the material composed of lime, water, and sand (with or without hair for binding), used for coating walls, is recorded in English from c. 1300, via Old French plastre, from the same source, and in early use the English word often had the French spelling. The meaning "gypsum" is from late 14c.; plaster of Paris "powdered calcinated (heat-dried) gypsum," which sets rapidly and expands when mixed with water(mid-15c.) originally was made from the extensive gypsum deposits of Montmartre in Paris. Plaster saint "person who makes a hypocritical show of virtue" is by 1890.

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Gallo-Roman (adj.)
"belonging to Gaul when it was part of the Roman Empire," from combining form of Gaul + Roman. In reference to a language, and as a noun, the language spoken in France from the end of the fifth century C.E. to the middle of the ninth, a form of Vulgar Latin with local modifications and additions from Gaulish that then, in the region around Paris, developed into what linguists call Old French.
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Bastille (n.)
14th century Paris fortress, used as a prison and destroyed by revolutionaries on July 14, 1789, as a symbol of royal despotism; French, literally "fortress, gate tower" (see bastion). Many French cities kept their medieval gate-towers as prisons after other fortifications were removed. The word was in Middle English in the "fortress" sense as bastel, bastyle.
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polytechnic (adj.)

1805, "pertaining to or comprehending instruction in many (technical) subjects," from French École Polytechnique, name of an engineering school founded 1794 (as École des Travaux publics) in Paris; from Greek polytekhnos "skilled in many arts," from polys "many" (from PIE root *pele- (1) "to fill") + tekhnē "art" (see techno-). As a noun (short for polytechnic institution) from 1836. Related: Polytechnical.

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reunion (n.)

c. 1600, "act of coming together again," from re- "back, again" + union; or from French réunion (1540s). Meaning "a meeting of persons of previous connection" is from 1820.

The island of Reunion, formerly known as Bourbon, was renamed during the French Revolution (1793) in commemoration of the 1792 union of revolutionaries from Marseilles with the National Guard in Paris, renamed back to Bourbon after 1815, then back to the Revolutionary name after 1848.

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