Etymology
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circuitry (n.)

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

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p.a. (n.)

abbreviation of public address (system), attested from 1936.

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backfire (n.)

1832, American English, originally "a fire deliberately lit ahead of an advancing wildfire to deprive it of fuel," from back (adj.) + fire (n.). As a verb in this sense, recorded from 1886.

The noun meaning "premature ignition in an internal-combustion engine" is recorded by 1897. As a verb, of schemes, plans, etc., "to affect the initiator rather than the intended object" it is attested from 1912, a figurative use from the accidental back-firing of firearms.

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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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neuroscience (n.)

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

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boot (v.2)

1975, transitive, "start up (a computer) by causing an operating system to load in the memory," from bootstrap (v.), a 1958 derived verb from bootstrap (n.) in the sense of "fixed sequence of instructions to load the operating system of a computer" (1953).

This is from the notion of the first-loaded program pulling itself (and the rest) up by the bootstrap. The intransitive use, of a computer operating system, is from 1983. Related: Booted; booting.

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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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protectionism (n.)

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

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Sikhism (n.)

"tenets, practices, and religious system of the Sikhs," 1849, from Sikh + -ism.

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ethane (n.)

1873, from ethyl + -ane, the appropriate suffix under Hofmann's system.

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