Etymology
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metric (adj.)

"pertaining to the system of weights and measures based on the meter," 1855, from French métrique, from mèter (see meter (n.2)). In this sense, metrical is attested from 1797. Metric system is attested by 1855.

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neurology (n.)

"scientific study of the form and function of the nervous system," 1680s, from Modern Latin neurologia, from Modern Greek neurologia (1660s), from neuro- "nerves, the nervous system" (see neuro-) + -logia "study" (see -logy). Related: Neurological (1755).

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Third World (n.)
1963, from French tiers monde, formulated 1952 by French economic historian Alfred Sauvy (1898-1990) on model of the third estate (French tiers état) of Revolutionary France; his first world (The West) and second world (the Soviet bloc) never caught on.
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ownership (n.)

"state of being an owner; the right by which a thing belongs specifically to some person or body," 1580s, from owner + -ship. Ownership society, a concept combining the values of personal responsibility and economic freedom (2003) was popularized by U.S. president George W. Bush.

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diversification (n.)

"act of changing forms or qualities," c. 1600, noun of action from Medieval Latin diversificare "to diversify" (see diversify). Economic sense, in reference to the spread of production over a variety of services or articles, is attested from 1939, later of the spread of investments over a variety of enterprises.

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Peking 

former transliteration of the name of the Chinese capital city, now (in the pinyin system) called Beijing. In the Wade-Giles system it was Peiping; the form Peking pre-dates Wade-Giles and was formed by the old British-run, Hong Kong-based Chinese postal system. Peking duck, "large domestic duck of white plumage and orange beak and legs," is attested from 1880.

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circuitry (n.)

"plan or system of electrical circuits," 1946, from circuit (n.)+ -ry.

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neuroscience (n.)

"scientific study of the nervous system," 1963, from neuro- + science.

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ethane (n.)
1873, from ethyl + -ane, the appropriate suffix under Hofmann's system.
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protectionism (n.)

"doctrine or system of protection in political economy," 1846, from protectionist + -ism.

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