Etymology
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Nepal 

Himalayan nation north of India and south of Tibet, from Sanskrit Nepala, said to be from nipat "to fly down" (from ni "down" + pat "to fly") + alaya "abode, house." If this is right, the reference would be to villages in mountain vales. Related: Nepalese.

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naturopathy (n.)

"a theory of diseases that supposes they may be cured by natural agencies," 1901, a hybrid from combining form of nature + -pathy. A correct formation from all-Greek elements would be *physiopathy. Naturepathy is attested by 1869. Related: Naturopath.

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fifth column (n.)
1936, from Gen. Emilio Mola's comment at the siege of Madrid during the Spanish Civil War that he would take the city with his four columns of troops outside it and his "fifth column" (quinta columna) in the city.
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civil disobedience (n.)

coined 1866 by Thoreau as the title of his essay originally published (1849) as "Resistance to Civil Government."

If the alternative is to keep all just men in prison, or give up war and slavery, the State will not hesitate which to choose. If a thousand men were not to pay their tax-bills this year, that would not be a violent and bloody measure, as it would be to pay them, and enable the State to commit violence and shed innocent blood. This is, in fact, the definition of a peaceable revolution, if any such is possible. [Thoreau]
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D.A. 
American English initialism (acronym) for district attorney from 1934; for duck's ass haircut (or, as OED would have it, duck's arse), from 1951. The haircut so called for the shape at the back of the head.
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geriatrics (n.)
coined 1909 by Austrian-born doctor Ignatz L. Nascher (1863-1944) in "New York Medical Journal" on the model of pediatrics from geriatric (q.v.). Also see -ics. The correct formation would be gerontiatrics.
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Mozarab (n.)

"assimilated Christian in Moorish Spain," one who was allowed to continue practicing his religion in exchange for political allegiance, from Spanish Mozarabe "would-be Arab," from Arabic mostarib, from a desiderative verbal form of Arab. Related: Mozarabian (1706); Mozarabic.

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numerology (n.)

"study of the occult meaning of numbers, divination by numbers," 1911, a hybrid from Latin numerus "a number" (see number (n.)) + Greek -logia (see -logy). A correct formation would be arithmology, from Greek arithmos "number." Related: Numerological; numerologist.

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roleplay (n.)

also role-play, "act or condition of behaving as another would behave in a certain situation," 1958, from the verbal phrase, "to act out the role of" (by 1949); see role (n.) + play (v.). Related: Role-playing

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glyco- 
before vowels glyc-, word-forming element meaning "sweet," from Latinized combining form of Greek glykys, glykeros "sweet" (see gluco-). Used in reference to sugars generally. OED says a regular formation would be glycy-.
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